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Image Formation by Convex Lens

A concave len...

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A concave lens of focal length 20cm and double convex lens of focal length 30cm are placed 15cm apart on their common axis if an object is placed at distance x in front of concave lens then value of x so that image is formed at infinity is

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Q. A convex lens of focal length

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for an object situated at infinity. If a concave lens of focal length

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Q. A diverging lens of focal length 20 cm and a converging lens of focal length 30 cm are placed 15 cm apart with their principal axes coinciding. Where should an object be placed on the principal axis so that its image is formed at infinity?

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Q. An object (O) is placed in front of a concave lens of focal length 20 cm as shown in the figure. Determine the focal length of the convex lens if a real image is formed at a distance of 30 cm by the convex lens.

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