Question

a concave mirror of focal length 20cm is placed 50cm from wall. hoe far from the wall an object be placed to form a real image on the wall? ​

Answer 1

According to the question, f = -20cm

v =50cm.

u = ?

using mirror formula,

1/v +1/u =1/f

1/50 + 1/u = 1/-20

1/u =1/-20 -1/50

1/u = -5 -/ 100

u = - 1

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Answer 2

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