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The magnification of an object placed in front of a convex lens of focal length 40 cm is +4. To obtain a magnification of –4, the object will have to be moved by a distance equal to

40 cm फोकस दूरी के एक उत्तल लेन्स के सामने रखी एक वस्तु का आवर्धन +4 है। –4 आवर्धन प्राप्त करने के लिए, वस्तु को कितनी दूरी तक गति करानी होगी?

A
20 cm
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B
60 cm
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C
40 cm
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D
10 cm
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Solution

The correct option is A 20 cm
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