Tag: wave propagation (huygens' construction)

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Multiple choice physics wave optics huygens wave theory and wavefront wave propagation (huygens' construction) theories on light wave behaviour

Huygen's theory of secondary waves can be used of find-

  1. Velocity of light

  2. The wavelength of light

  3. Wave front geometrically

  4. Magnifying power of microscope
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Huygens principle states that every point on a wavefront acts as a source of secondary spherical wavelets, allowing us to geometrically construct the position of a wavefront at any subsequent time.

Multiple choice physics wave optics huygens wave theory and wavefront wave propagation (huygens' construction) theories on light wave behaviour

Coherent sources can be obtained:

  1. only by division of wave front

  2. only by division of amplitude

  3. both by division of amplitude and wave front

  4. none of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Coherent sources can be created by dividing the wavefront (e.g., Young's double slit) or by dividing the amplitude (e.g., thin film interference).

Multiple choice physics wave optics huygens wave theory and wavefront wave propagation (huygens' construction) theories on light wave behaviour

Assertion  $(A):$  Microwaves are better carries of signals than optical waves
Reason  $(R):$  Microwaves move faster than optical waves

  1. Both $A$ and $R$ are true and $R$ is correct explanation of $A$
  2. Both $A$ and $R$ are true and $R$ is not the correct explanation of $A$
  3. $A$ is true but $R$ is false
  4. $A$ is false but $R$ is true
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
A frequency of an optical wave is more than the microwave so optical waves are better canes of the signal, therefore, A is false. In medium (other than vacuum) speed of 0 microwaves 1A greater than optical wave hence R 1A true.
Ans. (D)
Multiple choice physics wave optics huygens wave theory and wavefront wave propagation (huygens' construction) theories on light wave behaviour

A wave pulse traveling on a two piece string, gets partially reflected and partially transmitted at the junction. The reflected wave is inverted in shape as compared to incident one. If the incident wave has wavelength  $\lambda$  and transmitted wave has  $\lambda ',$  then

  1. $\lambda '> \lambda$
  2. $\lambda' = \lambda$
  3. $\lambda' < \lambda$

  4. none
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Reflected wave is inverted hence second medium is dir sec with respect to first medium. $\lambda ' < \lambda $

$\frac{{\lambda '}}{t} < \frac{\lambda }{t} \Rightarrow \lambda ' < \lambda $
Ans. (C)

Multiple choice physics wave optics huygens wave theory and wavefront wave propagation (huygens' construction) theories on light wave behaviour

The wave front due to a point source at a finite distance from the source is -

  1. Spherical

  2. Cylindrical

  3. Plane

  4. Circular
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A wavefront originating from a localized point source spreads out uniformly in all directions in three-dimensional space, forming expanding concentric spheres at finite distances.