8.2 Revision

CONTENTS

REVISION QUESTIONS:

WAVES REVISION WORKSHEET No.1

1        Calculate the absolute refractive index for material X, if the velocity of light in material X is 2.1 x 108 ms-1. (1.43)

2        A ray of light in air is incident at an angle of 37o on the surface of the same material X used in Q.1.  Determine the angle of refraction in material X.  (24.9o)

3        A ray of light passes from kerosene to glass.  The angle of incidence of the light is 40.2o and the relative refractive index from kerosene to glass is 1.08.  Calculate the angle of refraction in the glass.  (36.7o)

4        Using relevant information from Q.3, calculate the absolute index of refraction of kerosene if the absolute index of refraction of glass is 1.5.  (1.39)

5        The speed of sound in air is 340 m/s.  A sound wave refracts on passing from air into an unknown medium and the wavelength of the sound changes from 0.02 m in air to 0.03 m in the unknown medium.  Calculate the speed of the sound wave in the unknown medium.  (510 m/s)

6        A ray of light passes from air into a glass prism at an angle of incidence of 39o.  If the angle of refraction in the glass is 23.7o, what is the speed of the light in the glass?  (1.92 x 108 ms-1)

7        The absolute refractive index of glass is 3/2 and that of water is 4/3.  Find the relative refractive index for light traveling from water to glass.  (9/8)

8        The critical angle for diamond is 24o.  Determine the refractive index of diamond.  (2.46)

9        A particular kind of glass has a refractive index of 1.46.  Calculate its critical angle.  (43.2o)  Find the subsequent path of rays of light incident internally on the surface of the glass at an angle of incidence of 70o.

10. A ray of light strikes the boundary between kerosene of absolute refractive index 1.39 and glass of absolute refractive index 1.51.  A diagram of the situation is shown below.

(a)     Determine the relative refractive index for light passing from
kerosene into glass.  (1.09).

(b)      If the angle of incidence of the ray is 33o, calculate the angle of refraction.  (30o

(c)      The speed of the light in the glass is 1.99 x 108 ms-1, find the speed of light in the kerosene.  (2.17 x 108 m/s)

(d)      Given that the frequency of the light in the glass is 4.7 x 1014 Hz, find the wavelength of the light in the glass.  (4.23 x 10-7 m)

(e)      State the frequency of the light in the kerosene.  (4.7 x 1014 Hz)

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