Q. 22

# <span lang="EN-US

Power of the accommodation of an eye is defined as the ability of an eye to change its focal length so as to focus the distant objects as well as nearby objects on the retina. The S.I. unit of power of lens is Diopter.

Given: focal length f1 = +10 cm

In meters f1 = +0.1 m

P = 1/f = 1/0.1

P = +10 D

There is positive sign on power, so lens A having focal length +10 cm is convex lens

focal length f2 = -10 cm

In metres f1 = -0.1 m

P = 1/f = 1/-0.1

P = -10 D

There is negative sign on power, so lens A having focal length -10 cm is concave lens

So, when the object is placed at 8 cm between optical center and focus on a convex lens, then image formed will be virtual and magnified. The ray diagram will be as follows:

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