Chapter 9

NCERT
Class 10
Science
Solutions
17. A doctor prescribes a rectifier lens of power +1.5 D. Find the focal length of the lens. Is the lens converging or diverging?

Question:

A doctor prescribes a rectifier lens of power +1.5 D. Find the focal length of the lens. Is the lens converging or diverging?

Answer:

Here P = 1.5 D

Power of lens P = 1/f (m)

f = 1/p

f = 1/1.5

f = 10/15

f = 2/3 m

Therefore, f = positive. Thus, it is a converging (convex) lens.

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