प्रकाश के किस रंग के लिए कि� – McqOptions

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1.	प्रकाश के किस रंग के लिए किसी लेन्स की फोकस दूरी अधिकतम होती है -
A.	बैंगनी
B.	नीला
C.	लाल
D.	पीला
Answer» D. पीला

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