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Q.

Find the diameter of the image of the moon formed by a spherical concave mirror of focal length 7.6 m. The diameter of the moon is 3450 km and the distance between the earth and the moon is 3.8×105 km.

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a

5.8 cm

b

4.5 cm

c

6.9 cm

d

5.6 cm

answer is D.

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Detailed Solution

f=−7.6u=−3.8×1051v=−17.6+13.8×105=−3.8×105−7.63.8×7.6×105v=−7.6mh1=−7.63.6×105×3450=6.9cm

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