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Two identical thin plano-convex glass le...

Two identical thin plano-convex glass lensses (refractive index 1.5) each having radius of curvature of 20 cm are jplaced with their convex suffaces in contact at the cenjtre. The intervening space is filled with oil of refractive index 1.7 The focal length of the combination is

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Two identical thin plano-convex glass lenses (refractive index 1.5) each having radius of curvature of 20 cm are placed with their convex surface 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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Two identical thin planoconvex glass lenses{refractive index 1.5) each having radius of curvature of 20 cm are placed with their convex surface in contact at the centre .The intervening space is filled with oil of refractive index 1.7.The focal length of the combination is.

A plano-convex lens has refractive index 1.6 and radius of curvature 60 cm. What is the focal length of the lens?

A plano-convex lens has refractive index 1.6 and radius of curvature 60 cm. What is the focal length of the lens?

A concavo-convex lens has refractive index 1.5 and the radii of curvature of its surfaces are 10 cm and 20 cm. The concave surface is upwords and is filled with oil of refractive index 1.6. The focal length of the combination will be