Two thin lenses of power +3.5 D and -2.5 D are placed in contact,

find the power and focal length of the lens combination.​

Answers

Answer 1

Answer:

P = 1 D

f = 1 m = 100 cm

Explanation:

The power of the combination of lenses is simply found out by adding the power of the individual lens:

[tex]P = P_{1}+P_{2}[/tex]

where,

P = Power of combination of lenses = ?

P₁ = Power of first lens = 3.5 D

P₂ = Power of second lens = -2.5 D

Therefore,

[tex]P = 3.5\ D - 2.5\ D[/tex]

P = 1 D

Now, for focal length:

[tex]Focal\ Length = f = \frac{1}{D}\\\\f = \frac{1}{1\ D}[/tex]

f = 1 m = 100 cm


Related Questions

William drew a diagram of a box containing a gas for his science project. His drawing is shown.

Answers

Question? U need a drawing

If the maximum moment of force on a door is 10 Nm by an applied force of 2.25 N, then the distance of handle

Answers

Answer:

d = 4.44 m

Explanation:

Given that,

The moment of force on a door = 10 N-m

The applied force, F = 2.25 N

We need to find the distance of the handle. The moment of force is given by :

[tex]\tau=F\times r[/tex]

Where

r is the distance of the handle.

[tex]r=\dfrac{\tau}{F}\\\\r=\dfrac{10}{2.25}\\\\r=4.44\ m[/tex]

So, the required distance is equal to 4.44 m.

Which type of reproduction takes a great deal of energy?



Asexual


Sexual

Answers

Answer:

Sexual

Explanation:

Sexual reproduction takes more energy and time. Since you know it requires two people of opposite sexes to "do it".

What happens when cooler downdrafts inside a supercell move across the edge of an upward moving mesocyclone?
A. A supercell
B. A me so cyclone
C. A tornado
D. A hurricane

Answers

That would make a tornado.

hey guys if anyone can help that would be amazing, this is due at noon​

Answers

Answer:

a.45N

b.52.2N

c.36.45N

Explanation:

note:these answers are based on the fact that the acceleration due to gravity is 10m/s²

*.first of all the tension (T)in the cable is equivalent to the mass(m) of object multiplied by the sum of the opposite and parallel accelerations of the gravity and the elevator respectively.ie. g and a

now that being said mathematically the formula for tension in the cable is given by

T=m(g+a).

a).now for this situation the elevator is stationary,thus has not accelerated,

so a=0

then T=mg; where m=4.5kg g=10ms-²

therefore, T=4.5*10=45N.

b).here the elevator accelerated up, so a is positive.ie.+a

hence T=4.5(10+1.6)=52.2N.

c).here also the elevator accelerated down, so a is negative. is.-a

hence T=4.5(10-1.9)=36.25N.

I hope this will be of good help to you, you can contact me for further explanations or questions.

Help FAST PLSS!!!
What is the period of a wave with a wavelength of 8 cm and a frequency of 0.5 hertz?(1 point)
0.125 seconds
4 seconds
0.0625 seconds
2 seconds
Two ropes are identical. A wave traveling through the first rope has a frequency of 1.5 hertz and a wavelength of 6 meters. What is the frequency of a wave in the second rope if its wavelength is 2 meters?(1 point)
3 hertz
1.5 hertz
9 hertz
4.5 hertz
If the wavelength of a wave in a particular medium is tripled, what will happen to the frequency of the wave?(1 point)
It will become one third of its original value.
It will become triple its original value.
It will depend on the speed of the wave.
It will remain constant.
If the speed of sound in air is 340 m/s, approximately how long will it take the sound of a clap of thunder to travel 2 kilometers?(1 point)
3.4 seconds
2.9 seconds
1.7 seconds
5.9 seconds
In music, the note G above middle C has a frequency of about 392 hertz. If the speed of sound in the air is 340 m/s, what is the approximate wavelength of this note?(1 point)
8.7 meters
0.87 meters
0.0026 meters
1.2 meters

Answers

Answer:1.) 2 seconds

2.) 4.5 hertz

3.) it will become one third is original value

4.)5.9 seconds

5.)0.87 meters

Explanation:

1. The time period of wave is 0.125 second

2. The frequency of a wave in the second rope is 1.5 hertz.

3. The frequency will become one third of its original value.

4. the time taken by sound of a clap of thunder to travel 2 kilometers is 5.9 seconds.

5. The wavelength of note is 0.87 meter

1. Time period [tex]=\frac{1}{frequency} =\frac{1}{8} =0.125second[/tex]

2. Since both rope are identical. Therefore, both rope have same frequency.

Thus,  The frequency of a wave in the second rope is 1.5 hertz.

3. In relation between wavelength and frequency, wavelength is inversely proportional to frequency.

If the wavelength of a wave in a particular medium is tripled , then the frequency of the wave will become one third of its original value.

4. The time taken by sound of a clap of thunder,

                                    [tex]=\frac{2000}{340}=5.9seconds[/tex]

5. Wavelength is the ratio of speed to the frequency.

                      [tex]Wavelength=\frac{340}{392}=0.87meters[/tex]

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https://brainly.com/question/17264163

which is true of Pluto?
A. Pluto has a moon that is about half it's size.
B. Pluto's orbit is shorter than than Saturn's.
C. Pluto orbits the sun every 2.5 earth years.
D. Pluto is only larger than Mercury.

Answers

Answer:d

Explanation:

Probably becuase it is further than Saturn

It takes like 70 years to go around the sun

And it is bigger than the moon

Answer: pluto has a moon that is about half of its size.

Explanation: just because

Question 19 (4 points) A 2-kg ball traveling in the y-direction (North) collides with a 6-kg ball, initially at rest. After the collision, the 6-kg ball is moving at 5 m/s, 53° West of North. The 2-kg ball is moving 37° East of North. 6 kg 530 5 m/s 379 VE 2 kg before 6 kg after 2 kg What was the initial speed of the small ball (before the collision)? 20 m/s 35 m/s 30 m/s 15 m/s 40 m/s 10 m/s 25 m/s​

Answers

I want to help really bad but is there a photo of this ?

A 720 N box is pushed by a mover 60 meters in 30 seconds. How much work is done?

Answers

Answer:

The work done will be "43,200 J".

Explanation:

The given values are:

Force,

F = 720 N

Distance,

S = 60 m

Time,

t = 30 sec

As we know,

⇒  [tex]Work \ done=Force\times Distance[/tex]

On substituting the values, we get

⇒                     [tex]=720\times 60[/tex]

⇒                     [tex]=43,200 \ J[/tex]

(b) The difference h between the two liquid levels is 2.0 cm. The density of the
liquid is 800 kg /m3.
Calculate the difference between the pressure of the gas and atmospheric
pressure.
.[2]
pressure difference

Answers

Answer:

101201.2 Pascal.

Explanation:

Given that the difference h between the two liquid levels is 2.0 cm. The density of the liquid is 800 kg /m3.

Calculate the difference between the pressure of the gas and atmospheric

pressure.

The pressure of the gas can be calculated by using the formula

Pressure = density × acceleration due to gravity × height

Substitute all the parameters into the formula

Pressure = 800 × 2/100 × 9.8

Note that the height is converted to metre.

Pressure = 156.8 Pascal

pressure difference = 101358 - 156.8

Pressure difference = 101201.2 Pascal

True or false:

1.Gravity is the weakest universal force, but it is the most effective over long distances.


True or false:

2.An artificial satellite in a low orbit will slow down and lose altitude due to the pull of Earth's gravity.

True or false:

3.Electromagnetic force is associated with charged particles.

Answers

False true true. Ébène end end e e e e

plzzzz help I need help ​

Answers

Answer:

1. It will never run out

2. It’s better for the eviroment

Explanation:

1. Coal is not a renewable source and take along time for it to form so it will soon run out

2. Burning coal releases fossil fums into the air affecting the ozone layer but using solar power dose not release anything into the air

Answer:

Renewable energy works as clean sources of energy, and don't make as much of a detrimental impact on the environment as non-renewable energy. Air pollutants are a product of some non-renewable sources, and it negatively affects the atmosphere, humans, animals, and oceans.

Also, renewable sources won't run out, unlike other sources, as they are finite and will not last forever.

I hope this helped!

A 75.0 kg driver slides into a seat in a truck that has only 1 spring. The spring compresses 1.60 cm = 0.0160 m. What is the spring constant of the spring in the seat?

Answers

Answer

0.510

Explanation:

The spring constant for the spring in above Table is 20 N/m.
Calculate the work done in stretching the spring until the extension of the spring is
0.050m

Work done =____J

Answers

The answer is 0.025J.

W=1/2*k*x^2
W=1/2*20*0.050^2
W=0.025J

Work is done when force is applied ____________________________________________?

Question options:

A. for a long period of time

B. in the opposite direction

C. in the same direction that the object moves

D. none of the above

Answers

Answer:

D none of the above

Explanation:

mark me brainlyest pls?

The answer is C.
When an object moves in the direction of the force, work is done.

PLEASE HELP!

A 1500 kg car moves forward with 30 kg • m/s of
momentum. What is its velocity?

Select One:

a: -1470 m/s
b: 0.02 m/s
c: -50 m/s
d: 45,000 m/s​

Answers

Answer: b

Explanation:

p=mv

p=30

m=1500

rearrange to find v

(30)=(1500)(v)

v= 30/1500

v = 0.02 m/s

What's Inertia ????☁️☁️​

Answers

Explanation:

the inability to change the position from rest to motion or motion to rest by themselves is inertia.

Answer:

Inertia is the property of a body in rest to resist motion or a body in motion to continue to its state of motion unless acted by external forces.

True or False: You can break apart the atoms in a polyatomic ion.
True
False

Answers

False because atoms can not be created or destroyed

a ball rolls off the edge of a balcony at 10 m/s. What is its speed after 1 s in the air

Answers

Answer:

V = 19.8 m/s

Explanation:

Given the following data:

Initial velocity = 10m/s

Time, t = 1 secs

We know that acceleration due to gravity is equal to 9.8m/s

To find the final velocity, we would use the first equation of motion;

[tex] V = U + at[/tex]

Where;

V is the final velocity.

U is the initial velocity.

a is the acceleration.

t is the time measured in seconds.

Substituting into the formula, we have;

V = 10 + 9.8*1

V = 10 + 9.8

V = 19.8 m/s

The temperature inside a Carnot refrigerator placed in a kitchen at 22 degree Celcius is 2 degree Celcius. The heat extracted from the refrigerator is 89 MJ/h. What power is needed to operate this refrigerator?

Answers

Answer: 1.79 kW

Explanation:

Given

The temperature of the refrigerator is [tex]T_L=2^{\circ}C\approx 275\ K[/tex]

The temperature of the kitchen is [tex]T_H=22^{\circ}C[/tex]

COP of the refrigerator is

[tex]COP=\dfrac{T_L}{T_H-T_L}=\dfrac{\text{Desired effect}}{\text{Power}}\\\\\Rightarrow COP=\dfrac{275}{22-2}=\dfrac{89}{P}\\\\\Rightarrow P=\dfrac{20}{275}\times 89=6.47\ MJ/h\ \text{or}\ 1.79\ kW[/tex]

This glass of lemonade is sitting in the hot summer sun. As time passes, in which direction will heat transfer take place?
ОА.
ice
lemonade
B.
lemonade -- air
. C.
air
lemonade
D.
ice - straw
E.
ice - air

Answers

Answer:

it A.

Explanation:

did the test on Edmentum and got it right

Describe how an electromagnet can make a motor run.

Answers

An electric motor converts electrical energy into physical movement. Electric motors generate magnetic fields with electric current through a coil. The magnetic field then causes a force with a magnet that causes movement or spinning that runs the motor.

If the angle of reflection is 82 and the light ray strikes a flat mirror, what will the angle
if incidence be?

Answers

Answer:

82

Explanation:

According to law of reflection, the angle of incidence = angle of reflection

Answer:

The angle of incidence will be equal to the reflection.

Explanation:

The law of reflection states that when a ray of light reflects off a surface, the angle of incidence is equal to the angle of reflection.

So 82 would be the answer.

___occurs whenever electrons within a neutral
object move because of the electric field of a nearby charged
object

Answers

Answer:

The answer is Polarization

What is the most likely evidence of an energy transformation taking place when a wire that is twisted and turned breaks? (5 points)

Reddish glow is emitted as kinetic energy is transformed into thermal energy

Reddish glow is emitted as kinetic energy is transformed into electrical energy

Broken end of the wire turns hot as kinetic energy is transformed into thermal energy

Broken end of the wire turns hot as kinetic energy is transformed into electrical energy

Answers

I think the answer is C .

Answer:

C

Explanation:

Use the graph. Which time period was
the car moving the fastest?

Answers

Answer:

1,2,3,4

Explanation:

What's the name of the compound Cal2?

Answers

Answer:

The correct answer is calcium iodide.

Explanation:

Hope this helped Mark BRAINLIEST!!!

The compound with the chemical formula CaI₂ is called calcium iodide.

A compound is a substance formed when two or more elements chemically combine in specific proportions. It is characterized by a distinct chemical composition and properties that differ from the elements it is composed of. Compounds are held together by chemical bonds, which can be either ionic or covalent, depending on the nature of the elements involved.

Calcium Iodide (CaI₂):

Calcium iodide is an ionic compound composed of the elements calcium (Ca) and iodine (I). In this compound, calcium, which is a metal, donates two electrons to iodine, a non-metal, resulting in the formation of a calcium ion (Ca²⁺) and two iodide ions (I⁻). The ions are held together by electrostatic forces of attraction, forming a crystal lattice structure.

Calcium iodide is a white, crystalline solid that is highly soluble in water. It is commonly used in various applications, including as a catalyst in organic reactions, a source of iodine for nutritional supplements, and in the synthesis of pharmaceuticals.

Therefore, The correct answer is Calcium Iodide.

To learn more about compounds click:

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How many meters in 37 kilometers? If there are 1,000 meters in one kilometer

Answers

Answer:37000

Explanation:

37 x 1000= 37000

Can someone please give me this answer to this please

Answers

Uuuu I think 0.20 m/s


A 0.40 kg soccer ball has 20 J of kinetic energy. How fast is it moving?

Answers

1/2 x m x v^2 = 20J
1/2 x 0,40 x v^2 = 20J
v^2 = 20/0,5x0,4
v^2 = 100
v = 10
it is moving at 10 m/s
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