Question

A person wants to read a book placed at 20cm where near point of his eye is 30cm calculate power of lens ​

Answer 1

Answer:

1.66 D

Explanation:

Answer 2

Answer:

v= -30cm

u= 20cm

by using lens formula

1/f = 1/v - 1/u

1/f=(- 1/30) - (-1/20)

1/f= 1/20 - 1/30

1/f= 1/60cm

P= 100/60

P= 1.66D

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