Physics, asked by akashojha7628, 10 months ago

Two Identical Thin Plano Convex Glass Lenses (refractive index 1.5) each having radius of curvature of 20 cm are placed with their convex surfaces in contact at the centre. The intervening space is filled with oil of refractive index 1.7. The focal length of the combination is ?

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Answered by anu012

2

Answer:

the focal length of the combination is -3

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