A convex lens 'A' of focal length \( 20 \mathrm{~cm} \) and a conca...

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A convex lens 'A' of focal length \( 20 \mathrm{~cm} \) and a concave lens ' \( \mathrm{B} \) ' of focal length \( 5 \mathrm{~cm} \) are kept along the same axis
\( \mathrm{P} \) with a distance ' \( \mathrm{d} \) ' between them. If a parallel beam of

W light falling on ' \( A \) ' leaves ' \( B \) ' as a parallel beam, then the distance ' \( \mathrm{d} \) ' in \( \mathbf{~ c m} \) will be:
(a) 15
(2021)
(c) 30
(b) 50
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