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प्रश्न
If the focal length of a spherical mirror is 12.5 cm, its radius of curvature will be:
(a) 25 cm
(b) 15 cm
(c) 20 cm
(d) 35 cm
उत्तर
25 cm
Radius of curvature 'R' = 2f
`R= 2xx`12.5
= 25cm
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