Two thin convex lenses of focal lengths 25 cm and 10 cm respectively are placed at a distance ‘d’. If a parallel beam incident on the first lens emerges as a parallel beam from the second lens, then the value of ‘d’ is
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Two thin convex lenses of focal lengths 25 cm and 10 cm respectively are placed at a distance ‘d’. If a parallel beam incident on the first lens emerges as a parallel beam from the second lens, then the value of ‘d’ is