Question

5. An ophthalmologist prescribed Suresh to use a lens of power – 2.5D for correcting his eye defect

i) What is the focal length of corrective lens used ?​

Answer 1

A lens having a power +1.5 D will have a focal length of

P =1/f

+1.5 D = 1/f

f = 1/1.5 = 2/3 = + 0.67 m.

The focal length is + 0.67m.

The nature of lens is converging type or convex lens.

The defect of the eye is Hyperopia or far-sightedness.

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Answer 2

power of lens = 1/focal length (m)

-2.5=1/focal length

focal length is -2.5m and concave lens prescribed

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