A motor car is fitted with a convex driving mirror of focal length 20 cm. A second motor car 2.01 m broad and 1.005m high is 40 m behind the first car. The size of the image of the second car seen in the mirror of the first, is.
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a
Breadth = 8cm, height = 4 cm
b
Breadth = 1cm, height = 0.5 cm
c
Breadth = 12cm, height = 6 cm
d
Breadth = 14cm, height = 7 cm
answer is B.
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Detailed Solution
f = 20cm, u = -4000cm. Using , 1v+1u =1fwe get .v=4000201cm Also m= IO=vu=4000201×14000=1201 Size of the image =1201 (size of object)
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A motor car is fitted with a convex driving mirror of focal length 20 cm. A second motor car 2.01 m broad and 1.005m high is 40 m behind the first car. The size of the image of the second car seen in the mirror of the first, is.