Question

a canvave mirror produce 5 times inlarged real image of object placed 20 cm .Calculate focal length
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Answer 1

Explanation:

The concave mirror produces three times enlarged image, so

m = 3

u = -10 cm

m=−vu

3 = (-v)/(-10)

v = +30

The distance between the mirror and image = 30 cm

From mirror formula, we know

1v+1u=1f

130+1−10=1f

(-2)/30 = 1/f

-1/15 = 1/f

f = – 15 cm

The radius of curvature R = 2f

∴ R = 2 × (- 15)

R = – 30 cm

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Answer 2

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