The centre of curvature is 40 cm from the pole of a concave mirror. The focal length of the mirror is ______
Answers
Answered by
1
Answer: 20
Explanation:
When the rays coming from infinity strikes the mirror it will be reflected back passing throught the focus.
The relation between radius of curvature and the focal length is given as
R=2f
f= 40/2
The focal length is 20cm
Hence parallel beam of light will be focused at focal length.
Answered by
1
Answer:
20
Explanation:
W.K.T
r=2f
So,
F=r/2
F=40/2
F=20
Hope it helps
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