Concave and convex lenses, each has the same focal length \\[20\\text{ cm}\\] and they are put in contact to form a combination lens. This combination lens is used to view an object
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A magnifying glass is a combination of a convex lens of focal length 5cm and a concave lens of power 5D.If the dis†an ce of distinct vision is 20cm,calculate the magnifying power
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A convex lens A of focal length 20cm and a concave lens G of focal length 5cm are kept along the same axis with the distance between them. If a parallel beam
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Lenses and Optical Instruments
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A combination of concave and convex lens in contact is placed over a plane mirror. When a pin P is placed as shown in the figure, the image is formed at the