Question

Find the focal lenght of a concave mirror when the image distance is 20 m nd object distance is 1000 cm.​

Answer 1

Answer:

u=-20m

v=-100m

f=?

by mirror formula

1/f=1/v+1/u

1/f=-1/100-1/20

1/f=-1-5/100

1/f=-6/100

f=100/-6

f=-16.6m

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Answer 2

Explanation:

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