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एक से अधिक उत्तर प्रकार के प्रश्न

A parallel beam of light of width 4 cm falls successively on a thin convex lens of focal length 40 cm and then on a thin convex lens of focal length 10 cm placed at a distance d apart as shown below.

4 cm चौड़ाई वाला प्रकाश का एक समान्तर पुंज नीचे दर्शाए अनुसार एक दूसरे से d दूरी पर रखे 40 cm फोकस दूरी के एक पतले उत्तल लेन्स पर, तत्पश्चात् 10 cm फोकस दूरी के एक पतले उत्तल लेन्स पर क्रमिक रूप से आपतित होता है।


If the emergent rays are parallel to the incident rays, then

यदि निर्गत किरणें, आपतित किरणों के समान्तर हैं, तब

A
The distance between two lenses should be 50 cm

दोनों लेन्सों के मध्य दूरी 50 cm होनी चाहिए
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B
The distance between two lenses should be 30 cm

दोनों लेन्सों के मध्य दूरी 30 cm होनी चाहिए
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C
The width of emergent beam will be 0.5 cm

निर्गत पुंज की चौड़ाई 0.5 cm होगी
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D
The width of emergent beam will be 1 cm

निर्गत् पुंज की चौड़ाई 1 cm होगी
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Solution

The correct option is D The width of emergent beam will be 1 cm

निर्गत् पुंज की चौड़ाई 1 cm होगी
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