A convex lens of focal length and a concave lens of focal length are placed so as to have the same axis. If a parallel beam of light falling on convex lens leaves concave lens as a parallel beam, then the distance between two lenses will be |
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a) |
40 |
b) |
30 |
c) |
20 |
d) |
10 |

A convex lens of focal length and a concave lens of focal length are placed so as to have the same axis. If a parallel beam of light falling on convex lens leaves concave lens as a parallel beam, then the distance between two lenses will be |
|||||||

a) |
40 |
b) |
30 |
c) |
20 |
d) |
10 |

1 Answer - 5876 Votes

3537

Let distance between lenses be . As per the given condition, combination behaves as a plane glass plate, having focal length So by using |