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Light Reflection and Refraction
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09/08/2021 12:33 pm
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What is the relation between the focal length and radius of curvature of a spherical mirror (concave mirror or convex mirror)? Calculate the focal length of a spherical mirror whose radius of curvature is 25 cm.
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09/08/2021 12:35 pm
For a spherical mirror the principal focus (F) lies exactly mid-way between the pole (P) and centre of curvature (C). So, the focal length (f) of a spherical mirror is equal to half of its radius of curvature (R).
f = \(\frac{R}{2}\)
R= 25cm (Given)
f = ?
We know that
f = \(\frac{R}{2}\)
= \(\frac{25}{2}\)
f = 12.5cm