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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?
आकृति
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उत्तर
At focus:

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क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
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:
