The slits in a Young's double-slit experiment have equal width and the source is placed symmetrically with respect to the slits. The intensity at the central fringe is \(I_0.\) If one of the slits is closed, the intensity at this point will be:
1. \(I_0\)
2. \(I_0/4\)
3. \(I_0/2\)
4. \(4I_0\)

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

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

A light wave can travel:

Choose the correct option:
1. (a) and (b)
2. (b) and (c)
3. (a) and (c)
4. (c) and (d)

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

Huygens' principle of secondary wavelets may be used to:

Choose the correct option:
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. All of these

Three observers A, B and C measure the speed of light coming from a source to be V_A, V_B and V_C. 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)

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. \(x+y+z=c\)

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

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)