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 3.8×105km.

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a

5.8 cm

b

5.6 cm

c

4.5 cm

d

6.9 cm

answer is D.

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Detailed Solution

f=7.6u=3.8×1051v=17.6+13.8×105=3.8×1057.63.8×7.6×105v=7.6mh1=7.63.6×105×3450=6.9cm

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