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प्रश्न
If R is the radius of curvature of a spherical mirror and f is its focal length, then:
(a) R = `f`
(b) R =` 2f`
(c) R = `f/2`
(d) R = `3f`
उत्तर
R = 2f
If R is radius of curvature of a spherical mirror and f is its focal length, then R=2f
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