Question

A divergent lens produces an image of magnification 0.5 when the object distance is 10 cm. The focal
power of the lens (in diopters)
A) + 4
B) - 4
C) + 10
D) -10

Answer 1

Answer:

D) -10

Explanation:

Given :- m=0.5 for lens

to find f

for u = -10cm.

for a lens

m=v/u=0.5

u/2=v ⇒v=−5cm

from lens formula

1/v−1/u=1/f

⇒1/−5+1/10=1/f

f=−10cm

So P=−10D

Answer 2

Answer:

D) -10 is the correct option.