Where must point source of light be placed in front of a convex lens so as to obtain a parallel beam of light?
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Solution. If the point source of light is placed at the 'first focal point' (i.e. the focal point on the left of the optical centreof the convex lens), then the rays of light after being refracted through the length obtain a parallel beam of light.
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The source of light should be put at the focal point of the concave mirror so that it obtains parallel beam of light rays which travel parallel with the respect of principal axis .
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