Question

() A concave mirror is used as reflectors in torches, head lights of
automobiles etc. to obtain a parallel beam of light. State the position of
the source of light on the principal axis to obtain the parallel beam.​

Answer 1

Explanation:

torches, search lights and headlights of vehicles, the bulb is placed (a) between the pole and the focus of the reflector (b) very near to the focus of the reflector (c) between the focus and centre of curvature of the reflector (d) at the centre of curvature of the reflector

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Answer:

(B) Concave mirrors are commonly used in torches , search lights and vehicles headlights to get powerful parallel beams of light. Here the bulb is placed very near to the focus of the reflector as the incident rays, which passes-through the focus of concave mirror, after reflection become parallel to the principal axis of the mirror.

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Answer 2

Answer:

at

focal length

to get required beam