Question

Power of the lens is -20, its focal length
is
A
a) 25m
B
b) -3m
C
C) -0.50m
D
d) 50 m​

Answer 1

Answer:

Explanation:

P = 1/f ( if ‘f’ is in meters )

P = 100/f ( if ‘f’ is in centimetres )

So , f = 1/P  => -1/20  => -0.05 meters

“-0.05 meters” !!!