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- The radius of curvature of a spherical mirror is 20 cm. What is its focal length
. The radius of curvature of a spherical mirror is 20 cm. What is its focal length
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Ans: Radius of curvature (R) = 20 cm
Radius of curvature of the spherical mirror = 2 × Focal length (f)
R = 2f
f= R/2 = 20 / 2 = 10
Therefore, the focal length of the spherical mirror is 10 cm.
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