Question

The reciprocal of focal length of the eye lens is called power of lens the power of lens can be measured in diopter the focal length of a lens of Jayashree is 25 cm what is the power of a lens of the eye of Jayashree which type of lens spectacles should we wear

Answer 1

p=25d as f=p

otherwise 4d and should use a concave mirror

Answer 2

Given focal length is +25cm.

Therefore, Power = 100 / f

P = 100 / 25

P= +4D.

The required lens is a convex lens.

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