i) The radius of curvature of a spherical mirror is 20 cm . What is its focal length?
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Hence, the focal length of the given spherical mirror is 10 cm.
Explanation:
Radius of curvature, R = 20 cm Radius of curvature of a spherical mirror = 2 × Focal length (f)
R = 2 f
f = R /2
= 20 / 2
= 10
Hence, the focal length of the given spherical mirror is 10 cm.
Answered by
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Answer:
Radius of curvature (Ⓡ)
= 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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