Question

The lens A has the focal length of 25 cm wereas another lens B has a focal length of 60 cm Give reason to state which lens has more power A or B
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Answer 1

Answer:

I guess Lens B

Explanation:

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Answer 2

Given:-

• Focal length (f) of lens 'A' = 25Cm

• Focal length (f') of lens 'B' = 60Cm

To Find:-

• Power of both lens & Which lens have more power.

Solution:-

As we know that Power of lens is defined as reciprocal of its Focal length.

→ P = 1/f

Calculating the power of lens 'A'

Substitute the value we get

→ P = 100/25 ( 100cm = 1m)

→ P = 4/1

→ P = 4D

∴ The power of lens 'A' is 4D...........(i)

Now Calculating the Power of lens 'B'

→ P' = 1/f'

Substitute the value we get

→ P' = 100/60

→ P' = 10/6

→ P' = 1.66D

∴ The power of lens'B' is 1.66D.........(ii)

From equation (i) & (ii) we get

The lens 'A' has more Power.