Q522
The focal length of a concave mirror with a radius of curvature of 20.0 cm is :
A.
20 cm
B.
5 cm
C.
10 cm
AnswerD.
15 cm
Answer: Option C
Solution
Answer: Option C
Solution:
Let us assume f is focal lengthR is radius of curvature
According to the formula R = 2f
f = R/2
= 20/2
= 10 cm