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Two thin convex lenses of focal length and are separated by a distance of . The focal length of the combination is :-
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Important Questions on Ray Optics
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A convex lens of power is immersed in water. How will its power change?
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A convex lens is made up of three different materials as shown in the figure. For a point object placed on its axis, the number of images formed is
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The focal length of a convex lens is 10 cm and its refractive index is 1.5. If the radius of curvature of one surface is 7.5 cm, the radius of curvature of the second surface will be
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A plano-convex lens has a radius of curvature . It is silvered on its plane surface. Find focal length after silvering:-
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A plano-convex lens is made of material of refractive index . The radius of curvature of the curved surface is . The focal length of the lens is
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If in a plano-convex lens the radius of curvature of the convex surface is and the focal length of the lens is , the refractive index of the material of the lens will be :
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If a convex lens of focal length and a concave lens of focal length are combined together, what will be their resulting power?
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A convex lens is dipped in a liquid, whose refractive index is equal to the refractive index of the lens. Then, its focal length will
