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 others.
D. Concave mirror as well as concave lens.
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Answer:
D. concave mirror as well as concave lens
Explanation:
for light source
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