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प्रश्न
Where must a point source of light be placed in front of a convex lens so as to obtain a parallel beam of light?
आकृती
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उत्तर
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या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
Where must a point source of light be placed in front of a convex lens so as to obtain a parallel beam of light?
At focus:
