The lens A has a focal length of 25 cm whereas another lens B has a focal length of 60 cm. Giving reason state, which lens has more power : A or B.

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Solution

$f_{A} = 25 c m = 0.25 m$

$P_{A} = \frac{1}{f_{A}} = \frac{1}{0.25} = 4 D$

$f_{B} = 60 c m = 0.6 m$

$P_{B} = \frac{1}{f_{B}} = \frac{1}{0.60} = 1.66 D$

$S o P_{A} i s g r e a t e r t h a n P_{B}$

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Question 8
Which of the following statements is true?
(a) A convex lens has 4 dioptre power having a focal length 0.25 m.
(b) A convex lens has -4 dioptre power having a focal length -0.25 m.
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The lens A has a focal length of 25 cm whereas another lens B has a focal length of 60 cm. Giving reason state, which lens has more power : A or B.

fA=25 cm=0.25 m PA=1fA=10.25=4 D fB=60 cm=0.6 m PB=1fB=10.60=1.66 D So PAis greater than PB

$f_{A} = 25 c m = 0.25 m$

$P_{A} = \frac{1}{f_{A}} = \frac{1}{0.25} = 4 D$

$f_{B} = 60 c m = 0.6 m$

$P_{B} = \frac{1}{f_{B}} = \frac{1}{0.60} = 1.66 D$

$S o P_{A} i s g r e a t e r t h a n P_{B}$