1. Which of the following can make a parallel beam of light when light from a point source is incid

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1. Which of the following can make a parallel beam of light when light from a point source is incident on it?(a) Concave mirror as well as convex lens(b) Convex mirror as well as concave lens(c) Two plane mirrors placed at 90° to each other(d) Concave mirror as well as concave lens

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