# Arjun is a student of class VIII. During summer vacation, his parents planned a visit to Pondicherry by their car.

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Arjun is a student of class VIII. During summer vacation, his parents planned a visit to Pondicherry by their car. During the journey from Chennai to Pondicherry, Arjun sat on the front seat and his father was driving the car. Arjun observed that the road ahead on the highway appears to be wet as in figure. Hut when the car reached the spot, road is found to be dry. He was perplexed by this observation. He asked his father. His father advised Arjun not to disturb him during driving and said that he will discuss the problem on reaching Pondicherry. In the evening, when they were settled in a hotel at Pondicherry, Arjun's father told him that the illusion observed by Arjun was on account of atmospheric refraction. Now, Arjun was happy as he knew the real explanation of his observation.

1. Absolute refractive index of any medium is always _____.

a. Less than 1

b. Greater than 1

c. 1

d. 0

2. The refracting surfaces obey the ______.

a. Law of reflection

b. Law of refraction

3. State true or false?

Light travels faster in air than in glass or water.

a. TRUE

b. FALSE

4. The cold air layers of the atmosphere behave as optically

a. Either inactive or rarer medium

b. Denser medium

c. Rarer medium

d. Inactive medium

5. Deviation of light as it passes through the atmosphere due to variation in air density is called

a. Atmospheric dispersion

b. Atmospheric reflection

c. Atmospheric refraction

d. Atmospheric scattering

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1. b. Greater than 1

2. b. Law of refraction

3. a. TRUE

4. b. Denser medium

5. c. Atmospheric refraction