26) Light enters glass from air. The angle of refraction will be A) greater than

Question

26) Light enters glass from air. The angle of refraction will be A) greater than the angle of incidence. B) equal to the angle of incidence. C) less than the angle of incidence. Answer: C 27) Water waves pass by a piece of cork floating on the water that bobs up and down on complete cycle each second. The waves are 2 meters long. What is the speed of the wave? A) 0.25 m/s B) 0.50 m/s C) 1.0 m/s D) 4 m/s E) 2 m/s 28) What kinds of waves can show interference? A) Only longitudinal waves show interference. B) Only waves that are out of phase with each other show interference. C) All waves show interference. D) Only transverse waves show interference. 29) If the index of refraction of a material is 2, this means that light travels A) 2 times as fast in air as it does in vacuum. B) 2 times as fast in the material as it does in air. C) 2 times as fast in vacuum as it does in the material. D) 2 times as fast in the material than it does in vacuum. E) 1/2 as fast in air as it does in the material. 30) Light having a speed in vacuum of 3.0 x 108 m/s enters a liquid of refractive index 2.0. In this liquid, its speed will be A) 6.0 × 108 m/s B) 3.0 × 108 m/s C) 1.5 × 108 m/s D) 0.75 x 108 m/s E) 0.67 × 108 m/s

Explanation / Answer

26) (A) greater than the angle of incidence.

When light travels from denser (here glass) to rarer medium (here air), it bends away from the normal. SO the angle increases.

27) (D) 4 m/s

28) (C) All waves show interference.

29) (C) 2 times as fast in vaccuum as in medium.

n = c/v

=> v = c/n = c/2

or, c = 2v.

Hence 2 times as fast in vaccuum as in medium.

30) (C) 1.5 x 10^8 m/s

As shown above, v = c/n = c/2

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