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  4. A light ray in travelling between two media as given below. The angle of incidence on the boundary in all the cases is 30°. ldentify the correct sequence of increasing order of angles of refraction (1) air to water (2) water to glass (3) glass to water (Refractive indices of glass and water are respectively (3/2) and (4/3) )

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Q. A light ray in travelling between two media as given below. The angle of incidence on the boundary in all the cases is $30^\circ$. ldentify the correct sequence of increasing order of angles of refraction
(1) air to water
(2) water to glass
(3) glass to water
(Refractive indices of glass and water are respectively $\frac{3}{2}$ and $\frac{4}{3}$ )

EAMCETEAMCET 2006Ray Optics and Optical Instruments

Solution:

In case (i), ray travels from air (rarer) to water (denser) medium, so it bends towards the normal.
In case (ii), ray travels from water (less rarer than air) to glass (denser), so it bends (less as in case (i)) towards the normal.
In case (iii), ray travels from glass (denser) to water (rarer), so it bends away from the normal. Hence, correct sequence will be (a).