Question

1. When an object is placed at a distance of 15 cm from a concave mirror, it's image is formed at 10 cm. in front of the mirror. Calculate the focal length of the mirror..


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Answer 1

Answer:

6 cm

Explanation:

u=15 cm

v=10cm

we have

1/f=1/u +1/v

ie 1/f=1/15 + 1/10

1=f=1=6

thus, f=6cm ans

Hope it helps you