Tag: theories on light

Questions Related to theories on light

According to huygen's theory of secondary waves,following can be explained-

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

  1. Propagation of light in medium

  2. Reflection of light

  3. Refrection of light

  4. All of the above

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Correct Option: A,B

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

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

  1. Velocity of light

  2. The wavelength of light

  3. Wave front geometrically

  4. Magnifying power of microscope

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Correct Option: B

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

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

  1. Velocity of light

  2. The wavelength of light

  3. Wave front geometrically

  4. Magnifying power of microscope.

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Correct Option: B

Coherent sources can be obtained:

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

  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

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Correct Option: C

The wave theory in its original form was first postulated by 

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

  1. Issac Newton

  2. Thomas Young

  3. Christian Huygens

  4. Augustine Jean Fresnel

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Correct Option: C
Explanation:

Christian Huygens postulated wave theory.

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

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

  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

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Correct Option: D
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)

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

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

  1. $\lambda '> \lambda$

  2. $\lambda' = \lambda$

  3. $\lambda' < \lambda$

  4. none

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Correct Option: C
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)

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

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

  1. Spherical

  2. Cylindrical

  3. Plane

  4. Circular

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Correct Option: C

Particle nature and wave nature of electomagnetic waves can be shown by

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

  1. electron has small mass, deflected by the metal sheet

  2. X-ray is diffracted a, reflected by thick metal sheet

  3. light is refracted and diffracted

  4. light is polarised and shows photoelectric effect.

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Correct Option: D

Which of the following statements indicates that light waves are transverse 

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

  1. Light waves can travel in vacuum

  2. Light waves show interference

  3. Light waves can be polarized

  4. Light waves can be diffracted

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Correct Option: C