Question

The nearpoint of a certain eye in 80cm infront of the eye .What lens of focal length should be used clearly see an object 20cm infront of the eye​

Answer 1

Answer:

Answer

The person is suffering from myopia and hence need a concave lens to correct the defect. The lens should be such that an object at infinity must form its image at the far point.

Hence, f=−80 cm=−0.8 m

The power of the lens can be obtained as:

P=

f

1

P=

(−0.8)

1

=−1.25 D

Answer 2

Answer:

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