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Subject: Science, asked on on 13/5/20
Instructions: The path of a light ray, from air to three different media A, B, and C, for a given angle of incidence, is as shown. Study the diagrams carefully and answer the following questions.

?

1. Which of the three media A, B or C has maximum optical density??*

1 point

A

B

C

All of these have same optical density

2. Through which of the three media, will the speed of light be maximum??*

1 point

A

B

C

Light will travel with the same speed in all the three media

3. What is the refractive index of B relative to C ??*

1 point

More than unity

Less than unity

Equal to unity

zero

4. Will the light travelling from A to B bend towards or away from the normal or go without any bending??*

1 point

Towards the normal

Away from the normal

Will go straight without any bending

Can't say. Insufficient information given in the question.

5. If na, nb and nc denote refractive indices of the three media, arrange na, nb and nc in descending order??*

1 point

na > nb > nc

nc > nb > na

na = nb = na

nb > na > nc

6. What inference can be drawn about the optical density of the three media from the above diagram??*

1 point

All the three media are optically rarer than air

Optical density of all the three media is greater than 1

Optical density of all the three media is less than 1

Optical density of all the three media is equal to 1

7. For which ray of light, incident on any of the three media, will these three media show identical behaviour.?*

1 point

A ray falling at an angle of 45 degree

A ray falling at an acute angle with medium

A ray falling at an obtuse angle with medium

A ray falling normally on the medium

8. If a ray of light is incident in medium C, at an angle of 40 degree, what will be its angle of refraction in air??*

1 point

40 degree

45 degree

50 degree

60 degree

9. If angle of incidence is increased, what will be the change in the angle of refraction??*

1 point

No change as per Snell's law, ratio is constant

Angle of refraction also increases such that ratio sin i/sin r remains constant.

Angle of refraction decreases as the medium is optically denser

Angle of refraction first increases and then decreases as per Snell's Law

10. What is the ratio of speed of light in medium A to the speed of light in medium B??*

1 point

more than 1

equal to 1

less than 1

speed of light in medium A = speed of light in medium B
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