Question

Find the position of the object placed infront of a concave mirror of focal length 20 cm if image is formed at the distance of 30 cm from the mirror

Answer 1

Answer:

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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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