NDA 2017 Physics question

Concave mirror is used in headlights of vehicles, because it

(A)focuses light from the bulb onto nearby vehicles
(B)sends parallel raysCorrect
(C)fits well into the shape of the headlight
(D)is cheaper than other mirrors

Answer: (B)

Solution

When the bulb is placed at the principal focus of a concave (parabolic) mirror, the rays reflected from the mirror emerge parallel to the principal axis. This

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Question ID VK-030899