Question

Far point of a person is 5 m. What is the lens he should use to correct his defect? What is it's focal length ?​

Answer 1

Answer:

x− distance of far point =5meters

f=focal length of correcting lens

For lens, v=image distance=−x ,u=object distance =α

f

1

=

v

1

+

u

1

=

−x

1

+

α

1

So f=−5m

Since it is negative ,it is concave lens.

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