Question

A point object is moving on the principal axis of a concave mirror of focal length 30 cm and speed

Answer 1

Answer:

30 cm

Explanation:

Here,

u= -30 cm

f= -20 cm

By using mirror formula,

1/v + 1/u = 1/f

1/v + 1/-30 = 1/-20

v= -60 cm

negative sign indicates that image is in front of the mirror

Therefore,

The distance between image and object = 60–30 = 30cm

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