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Q.

A concave mirror has a focal length of 16.2 cm, and a 4 cm tall light bulb is placed at a distance of 8.1 cm from the mirror. The distance of the image from the mirror is ____________.

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a

16.5 cm

b

20 cm

c

17.85 cm

d

16.2 cm

answer is A.

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Detailed Solution

detailed_solution_thumbnail

Object distance u = - 8.1 cm

Focal length f = -16.2 cm

By, Mirror Formula, we have 1/f = 1/u + 1/v

1v = 1f - 1u

1v=1(-16.2) - 1(-8.1)

1v = -116.2 + 18.1

V = -1+2 16.2 = 116.2

V = 16.2 cm

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