नेत्र लेंस की फोकस दूरी क्या हैनेत्र लेंस की फोकस दूरी बताइए
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Answer: The distance from the magnifying lens to the piece of paper is the focal length. For the eye, light from distant objects is focused onto the retina at the back of the eye. The eye is about the size of a table tennis ball, so the focal length needs to be about 2.5 cm.
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