Question

A convex lens of refractive index has a power of 2.5 D in air. If it is placed in a liquid of refractive index 2, then the new power of the lens is:

A

- 1.25 D

B

- 1.5 D

C

1.25 D

D

1.5 D

Medium
AIIMS

Solution

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Correct option is A)

According to Lens Maker's Formula,
Power of lens
where is the refractive index of material of lens relative to the surrounding medium
For convex lens in air,
For convex lens in the liquid,
Thus

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