Question

When a bright object is placed 10 cm away from a concave mirror its real image is formed at a distance of 40 cm from the mirror. What is the focal length of the mirror?

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Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

-8 cm.

Explanation:

u= -10 cm

v= -10 cm

f= ?

Using mirror formula

1/v+1/u=1/f

f=uv / v+u

400/-50

= -8 cm