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In the figure (i) a thin lens of focal length 10 cm is shown. The lens is cut into two equal parts and arranged as shown in the figure (ii). An object AB of height 1 cm is placed at a distance of 7.5 cm then, height of the final image will be

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Important Questions on Ray Optics

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A convex lens of focal length 40 cm is kept in contact with a concave lens of focal length -25 cm. The power of the combination is
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The plane faces of two identical plano-convex lenses each having a focal length of 40 cm are pressed against each other to form a usual convex lens. The distance from this lens, at which an object must be placed to obtain a real, inverted image with magnification one is
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A convex lens and a concave lens, each having same focal length of 25 cm, are put in contact to form a combination of lenses. The power in dioptres of the combination is
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A plano-convex lens of refractive index 1.5 and radius of curvature 30 cm is silvered at the curved surface. Now the lens has been used to form the image of an object. At what distance from, this lens an object be placed in order to have a real image of the size of the object?
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A plano-convex lens is made of a material of refractive index μ=1.5. The radius of curvature of curved surface of the lens is 20 cm. If its plane surface is silvered, the focal length of the silvered lens will be :
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Power of combined lenses of focal lengths 20 cm and 25 cm respectively:
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Dispersive power of a prism depends on-
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When white light passes through a prism, the colour which deviates the least is _____.