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Earn 100
A distance separates two thin convex lenses of focal lengths and For what value of a parallel beam of light falling on this combination parallel to the common principal axis emerges out of the combination as a parallel beam ?
Important Questions on Ray Optics and Optical Instruments
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Show that for a thin prism the deviation is given by
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Draw the ray diagram for formation of primary rainbow.
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A bi-convex lens has a focal length equal to half the radius of curvature of either surface. What is the index of refraction of the lens material ?
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A ray of light enters a liquid and a bent towards the normal as shown. Calculate the speed of light in the liquid.
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If the absolute refractive index of glass is and water is Find the ratio of focal lengths of a glass lens when in water and when in air.
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A ray of light is incident on a glass sphere at an angle of incidence Show that angle of emergence is
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Write lens maker's formula and describe the symbols used in it.
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It is desired to decrease the focal length of a convex lens. Should you keep it in contact with a convex or a concave lens ?
