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प्रश्न
A small bulb is placed at the focal point of a converging lens. When the bulb is switched on, the lens produces ______.
पर्याय
a convergent beam of light
a divergent beam of light
a parallel beam of light
a patch of coloured light
MCQ
रिकाम्या जागा भरा
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उत्तर
A small bulb is placed at the focal point of a converging lens. When the bulb is switched on, the lens produces a parallel beam of light.
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