Question

What is the power in D of the eyes of a woman who can see an object clearly at a distance of only 9.5 cm

Answer 1

Step-by-step explanation:

It is the far point an myopic person . For it she uses concave lens . For her ,

object distance u = infinity

image v = - 9.5 cm

f = ?

form the lens formula

`(1)/(f) = (1)/(v) - (1)/(u) \\`

`(1)/(f) = (1)/(-9.5) - 0 \\`

f = - 9.5 cm = - 9.5 / 100 m

P = 1 /f = - 100 / 9.5 = - 10.52 D .