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Two convex lenses, of focal lengths 20 c...

Two convex lenses, of focal lengths 20 cm and 10 cm, respectively are separated by a distance of x cm. If a parallel beam of light remain parallel after refraction through both the lenses find x.

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(a) Condition for emergent beam to remain parallel after refraction through both the lens in terms of their foci.
(b) Foci of two lens coincide.
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