Question

The far point of a person suffering from myopia is 4m from the eye. Find the power of corrective lens required.
ᴍʏ ᴀɴsᴡᴇʀ ɪs -0.25D
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Answer 1

Explanation:

Hola ! guys here's Ur ans...

When the object is at infinity the virtual image should form at 4m..

u = infinity..

V = - 4 cm.

1/f = 1/v - 1/u

= 1/f = 1/ -4+1/ infinity

= F = -4 cm..

and, the P = 1/f = 1/-4= - 0. 25D (ans)..

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Answer 2

Explanation:

When the object is at infinity the virtual image should form at 2m

u=∞

v=−2m

f

1

=

v

1

−

u

1

f

1

=

−2

1

−

∞

1

f=−2m

Now power P=

f

1

=

−2

1

=−0.5D

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