Fill in the Blank : A convex lens A of focal length 20 cm and a concave lens B of focal length 5 cm are kept along the same axis with a distance d between them. If a parallel beam of light falling on A leaves B as parallel beam, then d is equal to . . . . . . cm.
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Hey Frnd Ur Answer Is-15 cm
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15 cm..............✔✔✔
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