Question

a person suffering from myopia.His far point is 5m. What should be focal length​

Answer 1

Answer:

Answer

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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Answer 2

Explanation:

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

u=∞

v=−2m

f1=v1−u1

f1=−21−∞1

f=−2m

Now power P=f1=−21=−0.5D