Transmission of Light in Different Medium

Q. Light travels with a speed in water than in air.

1. faster
2. slower
3. equal

Q.

Rainbow is an example for continuous spectrum. Explain

Q.

State the speed of light in (a) air, (b) water, and (c) glass.

Q. Can anything travel at speed of light?

Q. Consider the following statements:

1. Light travels slower in oil than in water.


2. Light bends towards the normal, when travelling from an optically rarer to an optically denser medium.

1. Statement 2 is the correct reasoning for statement 1.
2. Statement 2 is not the correct reasoning for statement 1.
3. Both the statements are true.
4. Both the statements are false.

Q. Considering the speed of light in a medium, pick the odd one out.

1. $1.25\times {10}^8{\text{m s}}^{-1}$
2. $4.7\times {10}^8{\text{m s}}^{-1}$
3. $2.8\times {10}^8{\text{m s}}^{-1}$
4. $5.3\times {10}^7{\text{m s}}^{-1}$

Q.

What is the physical significance of refractive index?

1. It tells how faster the light is moving in that medium

2. It tells the density of the medium.

3. It says how much air resistance the medium has.

4. It doesn't have any significance.

Q.

If the speed of light is $3\times {10}^8\raisebox{1ex}{$m$}\!\left/ \!\raisebox{-1ex}{$s$}\right.$, determine the distance it takes in $1$light year. Report your results in $km$ and in $m$.

Q. The Speed of light in vacuum is:

1. $2\times {10}^{10}m/s$
2. $3\times {10}^{8}m/s$
3. $4\times {10}^{5}m/s$
4. $2\times {10}^{12}m/s$

Q. Fermet's theorem states that light always takes thepath.

1. shortest
2. quickest
3. longest

Q. Name the part of the eye which gives colour to the eyes.

1. Retina
2. Iris
3. Cornea
4. Fovea

Q. Match the materials given below with the speed of light in them.
Column I Column II
1. Air (a) 2 × ${10}^8$ m/s
2. Water (b) 3 × ${10}^8$ m/s
3. Glass (c) 2.25 × ${10}^8$ m/s

1. 1: (c); 2: (a); 3: (b)
2. 1: (a); 2: (c); 3: (b)
3. 1: (b); 2: (c); 3: (a)
4. 1: (a); 2: (b); 3: (c)

Q.

Question 14

What happens to light when it gets dispersed? Give an example.

Q. When white light passes through a prism, it is
(a) deviated and dispersed.
(b) deviated but not dispersed.
(c) laterally displaced and not dispersed.
(d) reflected.

Q. When light passes from air to glass, its speed .

1. remains the same
2. increases
3. decreases

Q. how Snells law joins with the Refractive index, as Snells law talk about angle and refractive index talk about the optical density.

Q. Fermet's theorem states that light always takes the_______path.

Q. Light travels fastest through which of the following medium?

1. Water
2. Glass
3. Vacuum
4. Air

Q. A plane mirror produces a real and laterally inverted image.

1. True
2. False

Q. Based on their refractive index, sort the speed of light in ascending order.

1. Diamond = 2.41
2. Ruby = 1.76
3. Glass = 1.5
4. Kerosene = 1.41
5. Water = 1.33

Q. Which of the statements refer to the laws of reflection?

Statement 1: Angle of incidence is always equal to the angle of reflection.

Statement 2: Angle of incidence is always twice the angle of reflection.

Statement 3: The incident ray, reflected ray and the normal all lie in 3 different planes.

Statement 4: The incident ray, reflected ray and the normal all lie in the same plane.

1. 2 & 3
2. 1 & 3
3. 2 & 4
4. 1 & 4