Physics Quiz: Trivia Questions On Wave Optics!

15 Questions | By Jagranjosh | Last updated: Mar 17, 2020 | Total Attempts: 511

Questions

Settings

Physics Quiz: Trivia Questions On Wave Optics!

Questions and Answers

1.

For sustained interference, we need two sources which emit radiations:
- A.
  
  Of the same intensity
- B.
  
  Of the same amplitude
- C.
  
  Having a constant phase difference
- D.
  
  None of these
2.

Two beams of light having intensities I and 4I interfere to produce a fringe pattern on a screen. The phase difference between the beams is π/2, at a point A and π at a point B. The difference between the resultant intensities at A and B is:
- A.
  
  2I
- B.
  
  4I
- C.
  
  5I
- D.
  
  7I
3.

n identical waves each of intensity I_o interfere each other. The ratio of maximum intensities if interference is coherent and incoherent is:
- A.
  
  N
- B.
  
  N²
- C.
  
  N³
- D.
  
  1/n²
4.

The initial shape of the wavefront of the beam is:
- A.
  
  Concave
- B.
  
  Convex near the axis and concave near the periphery
- C.
  
  Planar
- D.
  
  Convex
5.

Two coherent sources of intensity ratio β interfere. Then the value of
- A.
- B.
- C.
- D.
6.

The fringe width β of a diffraction pattern and the slit width d are related as:
- A.
  
  βαd
- B.
- C.
- D.
7.

Two periodic waves of intensities I₁ and I₂ pass through a region at the same time in the same direction. The sum of the maximum and minimum intensities is:
- A.
- B.
- C.
- D.
8.

A beam is used in young’s double slit experiment. The slit width is d. When the velocity of electron is increased, then
- A.
  
  No interference in observed
- B.
  
  Fringe width increases
- C.
  
  Fringe width decreases
- D.
  
  Fringe width remains same
9.

A Polaroid produces a strong beam of light which is:
- A.
  
  Circularly polarised
- B.
  
  Elliptically polarised
- C.
  
  Plane polarised
- D.
  
  Unpolarised
10.

The angle between pass axis of polarizer and analyzer is 45^o. The percentage of polarised light passing through analyzer is:
- A.
  
  100%
- B.
  
  50%
- C.
  
  25%
- D.
  
  75%
11.

A phase difference of 5π corresponds to a path difference (in terms λ) of:
- A.
  
  5λ
- B.
  
  10λ
- C.
  
  5λ/2
- D.
  
  2λ
12.

Two coherent monochromatic light beams of intensities I and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are:
- A.
  
  5I and I
- B.
  
  9I and I
- C.
  
  5I and 3I
- D.
  
  9I and 3I
13.

What happens if one of the slits, say S₁, in Young’s double slit experiment is covered with a glass plate which absorbs half the intensity of light from it?
- A.
  
  The bright fringes become less bright and dark fringes have a finite light intensity
- B.
  
  The bright fringes become brighter and dark fringes become darker
- C.
  
  The fringe width decreases
- D.
  
  No fringes will be observed
14.

In a double slit experiment, the distance between the slits is d. The screen is at a distance D from the slits. If a bright fringe is formed opposite of one of the slits, find its order:
- A.
- B.
- C.
- D.
15.

Two coherent monochromatic light sources are located at two vertices of an equilateral triangle. If the intensity due to each of the sources independently is 1Wm^-2 at the third vertex, the resultant intensity due to both the sources at that point (i.e., at the third vertex) is:
- A.
  
  Zero
- B.
- C.
  
  2
- D.
  
  4