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A small bulb is placed at the focal point of a converging lens. When the bulb is switched on, the lens produces:(a) a convergent beam of light (b) a pergent beam of light(c) a parallel beam of light (d) a patch of coloured light
(c) A parallel beam of light.
Explanation
When a small illuminated bulb is placed at the focal point of a converging lens, the lens produces a parallel beam of light. Because, according to the rules for obtaining images by a convex lens, when a beam of light is coming from the focus of a converging lens, it becomes parallel, after refraction from the lens.
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