Questions
Two convex lenses of focal lengths 20 cm and 30 cm are kept at a separation of 15 cm. Then power of the combination is
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Correct option is C
Equivalent focal length F is give by 1F=1f1+1f2−df1f2=120+130−1520×30am−1⇒ Power P=100FD=10020+10030−15×10020×30D=5.83 DSimilar Questions
Image of the sun is formed by a binconvex lens of focal length f. The image is a circular patch of radius r and is formed on the focal plane of the lens. Choose the correct statement from the following
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