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Physics CBSE Live product
Class 10 (2025-26)
Light reflection and refraction
Spherical mirrors
9.
Focal length of spherical mirror
Question:
4
m.
Solve the given problem:
The radius of curvature of a spherical mirror is
20
\(cm\). What is its focal length?
Formula to
focal length of the mirror
is,
\(f\ =\ 4R\)
\(f\ =\ 2R\)
\(f\ =\ \frac{R}{4}\)
\(f\ =\ \frac{R}{2}\)
Focal length
(\(f\)) \(=\)
\(cm\)
Important!
Note: Enter your answers with no decimal digits.
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