Two identical thin plano concave lenses u 1 5 each having radius of curvature 30...

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Two identical thin plano concave lenses u 1 5 each having radius of curvature 30 cm are placed in contact with common axis as shown in the figure If the intervening space is filled with oil of refractive index 1 8 the focal length of the combination is 50 cm 50 cm 25 cm 25 cm

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