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Answers
1. A ray of light traveling in air enters obliquely into water. Does the light ray bend towards or away from the normal? Why?
Ans. The light bends towards the normal on entry into water. It is due to the fact that as compared to air, the water is optically denser medium.
2. Light enters from air to glass having refractive index 1.50. What is the speed of light in glass? The speed of light in vacuum is 3x108 m/s.
Ans. Speed of light in vacuum (c) = 3 x 108 m/s.
Refractive index = c/v.
Speed of light in glass = 3 x 108 m/s/ 1.50
= 2 x 108 m/s
3. Find out, from Table (10.3), the medium having highest optical density. Also, find the medium with lowest optical density.
Ans. As per table, diamond has highest optical density (2.42). Medium with lowest optical density is air (1.0003)
4. You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in table 10.3
Ans. As the refractive index of water is least out of three substances, hence speed of light is maximum in water. So, light travels fastest in water.
5. The refractive index of diamond is 2.42. What is the meaning of this statement?
Ans. It means that speed of light in diamond is 2.42 times slower than speed of light in air.
Answer:
1. No the light travels in straight line on water but when the light travels in water we can see a bend surface of light it is called as diffraction.