# Huygens' principle of secondary wavelets may be used to: (a) find the velocity of light in a vacuum. (b) explain the particle behaviour of light. (c) find the new position of a wavefront. (d) explain Snell's law. Choose the correct option: 1. (a) and (b) 2. (b) and (c) 3. (c) and (d) 4. All of these

Subtopic:  Huygens' Principle |
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Three observers A, B and C measure the speed of light coming from a source to be VA, VB and VC. The observer A moves towards the source and C moves away from the source at the same speed. The observer B stays stationary. The surrounding space is water everywhere.

(a) $$v_{A}>v_{B}>v_{C}$$

(b) $$v_{A}<v_{B}<v_{C}$$

(c) $$v_{A}=v_{B}=v_{C}$$

(d) $$v_{B}=\frac{1}{2}\left(v_{A}+v_{C}\right)$$

Choose the correct option:

1. (a) and (b)

2. (b) and (c)

3. (c) and (d)

4. (a) and (d)

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Light waves travel in vacuum along the X-axis. Which of the following may represent the wavefronts?
1. $$x=c$$
2. $$y=c$$
3. $$z=c$$
4. $$x+y+z=c$$

Subtopic:  Huygens' Principle |
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If the source of light used in a Young's double-slit experiment is changed from red to violet,

 1 the fringes will become brighter. 2 consecutive fringes will come closer. 3 the intensity of minima will increase. 4 the central bright fringe will become a dark fringe.

Subtopic:  Young's Double Slit Experiment |
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A Young's double slit experiment is performed with white light.

(a) The central fringe will be white

(b) There will not be a completely dark fringe

(c) The fringe next to the central will be red

(d) The fringe next to the central will be violet

Choose the correct option:

1. (a) and (b)

2. (b) and (c)

3. (a), (b) and (d)

4. (a), (b) and (c)

Subtopic:  Young's Double Slit Experiment |
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Four light waves are represented by
(i)    y = a1 sin ωt        (ii)    y = a2 sin (ωt + ε)
(iii)    y = a1 sin 2ωt    (iv)    y = a2 sin 2(ωt + ε)

Interference fringes may be observed due to superposition of

(a) (i) and (ii)

(b) (i) and (iii)

(c) (ii) and (iv)

(d) (iii) and (iv)

Choose the correct option:

1. (a) and (b)

2. (b) and (c)

3. (c) and (d)

4. (a) and (d)

Subtopic:  Young's Double Slit Experiment |
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Which of the following properties of light conclusively support wave theory of light?

(a) Light obeys laws of reflection.

(b) Speed of light in water is smaller than the speed in vacuum.

(c) Light shows interference.

(d) Light shows photoelectric effect.

Choose the correct option:

1. (a) and (b)

2. (b) and (c)

3. (c) and (d)

4. All of these

Subtopic:  Superposition Principle |
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A light wave can travel:

 (a) in vacuum (b) in vacuum only (c) in a material medium (d) in a material medium only
Choose the correct option:
 1 (a) and (b) 2 (b) and (c) 3 (a) and (c) 4 (c) and (d)

Subtopic:  Huygens' Principle |
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If Young's double-slit experiment is performed in water,

1. the fringe width will decrease

2. the fringe width will increase

3. the fringe width will remain unchanged

4. there will be no fringe

Subtopic:  Young's Double Slit Experiment |
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A thin transparent sheet is placed in front of a Young's double-slit. The fringe-width will:
1. increase
2. decrease
3. remain same
4. become nonuniform

Subtopic:  Young's Double Slit Experiment |
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