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The radius of curvature of a spherical mirror is 20 cm. What is its focal length?

Text Solution

Verified by Experts

For convex mirror,
R = + 20 cm and R = 2f
`therefore" "f=20/2=10cm`
For concave mirror,
R = -20 cm and R = 2f
`f=-20/2=-10cm`
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