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Question

If lens A has focal length +15 cm and lens B has focal length +30 cm, find out which lens has more power?


A

Lens A has more power

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B

Lens B has more power

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C

Power of the lens cannot be determined

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D

Both have the same power

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Solution

The correct option is A

Lens A has more power


Given:
Focal length of lens A, fA=+15 cm=+0.15 m
Focal length of lens B, fB=+30 cm=+0.30 m

Power of lens is given by:
P=1Focal length

Hence,
Power of lens A:
PA=10.15=6.66 D

Power of lens B:
PB=10.30=3.33 D

PA>PB

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