The focal length of a spherical mirror of radius of curvature 30 cm is : (a) 10 cm (b) 15 cm (c) 20 cm (d) 30 cm

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Solution

Answer : (b) 15 cm

Explanation:
Focal length (f) and radius of curvature (R) are related as R=2f
f = R/2
(R = 30cm)
So, f = 30/2 = 15cm

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The focal length of a spherical mirror of radius of curvature 30 cm is : (a) 10 cm (b) 15 cm (c) 20 cm (d) 30 cm

Answer : (b) 15 cm Explanation: Focal length (f) and radius of curvature (R) are related as R=2f f = R/2 (R = 30cm) So, f = 30/2 = 15cm

Answer : (b) 15 cm

Explanation:
Focal length (f) and radius of curvature (R) are related as R=2f
f = R/2
(R = 30cm)
So, f = 30/2 = 15cm