If its speed in air is 3 × 10 8 ms -1 then what is its speed in glass? It is found that the ray emerges from the opposite face of the slab without being displaced. A ray of light enters a rectangular glass slab of refractive index 1.5.What is the meaning of this statement in relation to speed of light? The refractive index of diamond is 2.42.The refractive index of carbon disulphide is 1.63.Light of wavelength 500nm in air enters a glass plate of refractive index 1.5.What happens to light when it enters a rarer medium from a denser medium?.Does the apparent depth of a tank of water change, normally?.Will the image of all the letters lie in the same plane? A glass slab is placed over a page in which letters are printed in different colours.Define refractive index in terms of velocity and mass density.What is the relation between speed of light in a medium and refractive index?.If a ray of light passes from medium I to medium II without any change of direction, what can be said about the refractive indices of these media.Express the refractive index of the medium.Do frequency and wavelength change when light travels from one medium to another?.Name one factor on which the direction of bending of a ray of light depends.Mention two properties of a wave: one property which varies and the other which remains constant when the wave passes from one medium to another. How should a ray of light be incident on a rectangular glass slab so that it comes out from the opposite side of the slab without being displaced?.Which kind of mirrors are used in the headlights of a motor-car and why?.What is the nature of the image formed by a concave mirror if the magnification produced by the mirror is +3?.What will be the focal length of this mirror? Which type of spherical mirror will it provide? The outer surface of a hollow sphere of aluminium of radius 50 cm is to be used as a mirror.Between which two points related to a concave mirror should an object be placed to obtain on a screen an image twice the size of the object?.Between which two points of a concave mirror should an object be placed to obtain a magnification of -3?.Explain why a ray of light passing through the centre of curvature of a concave mirror, gets reflected along the same path.An object is placed between the pole and focus of a concave mirror.Redraw the diagram given below in your answer book and show the direction of the light ray after reflection from the mirror.Draw the following diagram and show the formation of image of the object AB with the help of suitable rays.Why are reflecting prisms used in periscopes?.What is lateral inversion? Explain with a suitable example.How image can be located which is formed by a plane mirror?.What happens when a ray of light falls normally on the surface of a mirror?.ADDITIONAL QUESTIONS FOR PRACTICE VERY SHORT ANSWER QUESTIONS
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