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Two symmetric double convex lenses A and B have the same focal length, but the radii of curvature differ so that, RA=0.9 RB. If nA=1.63, find nB.

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Important Questions on Ray Optics

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When a lens of power P (in air) made of material of refractive index μ is immersed in a liquid of refractive index μ0. Then the power of the lens is:
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A thin symmetrical double convex lens of power P is cut into three parts as shown in the figure below. Power of A is:

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A convex lens makes a real image of height 4 cm on a screen. When the lens is shifted to a new position without disturbing the object or the screen, a real image of height16 cm is obtained on the screen. The length (height) of the object is :
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An object is placed at a distance of 10 cm from a convex lens of power 5 D. Find the position of the image.
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The radius of the convex surface of plano-convex lens is 20 cm and the refractive index of the material of the lens is 1.5. The focal length of the lens is
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A symmetric double convex lens is cut in two equal parts by a plane perpendicular to the principal axis. If the power of the original lens is 4 D, then the power of a cut lens will be
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A point object is placed at the focus of a double concave lens. The image is formed
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A thin convex lens of refractive index 1.5 is placed in a liquid with refractive index 2.0. If the power of the lens in air is 10 D then, its power in the liquid will be