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Figure shows a torch sending a parallel beam of light fixed on a wall and a plane mirror which forms a spot on the wall. As the mirror moves towards the wall, the spot on the wall moves

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Important Questions on Ray Optics and Optical Instruments

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A lens forms a sharp image on a screen. When a glass slab of refractive index μ is placed between the screen and lens, the screen has to be moved away by a distance d, in order to form the sharp image again. If surrounding medium is air, the thickness of slab is
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For an eye kept at a depth h inside water of refractive index μ, and viewed outside, the radius of circle through which the outer objects can be seen, will be
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White light is incident on the interface of glass and air as shown in the figure. If green light is just totally internally reflected then the emerging ray in air contains

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In a spherical paper weight R=10 cm made of glass of refractive index μ=32, an object is embedded at a distance 5 cm from its centre. What is the apparent position of the object when seen from the opposite side (see figure)?

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A tank contains a transparent liquid of refractive index μ. The bottom of the tank is a plane mirror as shown. A person at P looks at an object O and its image in the mirror. The distance between the object and its image in the mirror as perceived by the person is

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A convex lens A of focal length 20 cm and a concave lens B of focal length 5 cm are kept along the same axis with a distance d between them. If a parallel beam of light falling on A leaves B as a parallel beam, then the distance d in cm will be
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Focal length of an equiconvex lens is 20 cm. The refractive index of material of the lens is 1.5. Now one of the curved surface is silvered. At what distance from the lens an object is to be placed, so that image coincides with the object?
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An object is placed 1.5 m in front of the curved surface of a planoconvex lens whose flat surface is silvered. A real image is formed 300 cm in front of the lens. The focal length of the lens is

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