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(B) When a parallel beam of light is incident on the first convex lens of focal length $f_1$,it converges at its second focal point,which is at a dist

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$30$

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(B) When a parallel beam of light is incident on the first convex lens of focal length $f_1$,it converges at its second focal point,which is at a distance $f_1$ from the first lens.For the rays to emerge as a parallel beam after passing through the second convex lens of focal length $f_2$,the light rays must be incident on the second lens such that they appear to come from its first focal point. This means the focal point of the first lens must coincide with the focal point of the second lens.Therefore,the distance $d$ between the two lenses must be equal to the sum of their focal lengths:$d = f_1 + f_2$$d = 20\, cm + 10\, cm = 30\, cm$Thus,the distance between the two lenses should be $30\, cm$.

$A$ parallel beam of light is incident on a system of two convex lenses of focal lengths $f_1 = 20\, cm$ and $f_2 = 10\, cm$. What should be the distance between the two lenses so that the rays after refraction from both the lenses emerge as a parallel beam?........$cm$

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