Answer:
The formula is
P(diopter) = \frac{1}{f (metres)}
f=\frac{1}{-2}
= -0.5m
when focal length is negative then it is concave lens.
Copyright © 2024 EHUB.TIPS team's - All rights reserved.
Answers & Comments
Verified answer
The power of the lens given is -2D.It has negative sign, which means that it is a concave lens.
Now, the formula for the power is P = 1/f.
Let’s put the given value. -2 = 1/f
On simplifying we get, f = -1/2 m
By converting the result into centimetres, we get, f = -1/2 X 100
Therefore, focal length =-50cm.
Answer:
The formula is
P(diopter) = \frac{1}{f (metres)}
f=\frac{1}{-2}
= -0.5m
when focal length is negative then it is concave lens.