Tag: wave optics

Questions Related to wave optics

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.

Show answer
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

Show answer
Correct Option: C

On a hot summer night,the refractive index of air is smallest near the ground and increases with height from the ground. When a light beam is directed horizontally , the Huygen's principle leads us to conclude that as it travel,the light beam:

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

  1. bends downwards

  2. bends upwards

  3. becomes narrower

  4. goes horizontally without any deflection

Show answer
Correct Option: C

Huygens' principle is used to

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

  1. obtain the new position of wavefront geometrically

  2. explain principle of superposition of waves

  3. explain interference

  4. explain polarization

Show answer
Correct Option: C

When light suffers reflection at the interface between water and glass, the change of phase in the reflected wave is

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

  1. Zero

  2. $\pi$

  3. $\pi$/2

  4. 2$\pi$

Show answer
Correct Option: B
Explanation:

On reflection from denser medium, phase reversal occurs i.e. phase change $=\pi$ takes place, because glass is much denser than water.

On reflection from a plane surface, the following two characteristics get changed :

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

  1. Wavelength

  2. Frequency

  3. Velocity

  4. Amplitude

Show answer
Correct Option: C,D
Explanation:

On reflection from a plane surface velocity and amplitude of the incident ray changes whereas wavelength and frequency does not change.

Huygen's originally thought that for the propagation of light waves wavefront is required.

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

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

The above statement is true.

As Huygens' principle lets you predict where a given wavefront will be in the future, if you have the knowledge of where the given wavefront is in the present.

The wave theory of Light was proposed by ...............

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

  1. Newton

  2. Huygens

  3. Frenel

  4. Yung

Show answer
Correct Option: B
Explanation:

Newton has given the theory that light is made of tiny particles. In 1678, Dutch physicist, Christiaan Huygens, believed that light was made up of waves vibrating up and down perpendicular to the direction of light, and therefore formulated a way of visualizing wave propagation. This known as 'Huygens' Principle'. 

Who proposed wave nature of light ?

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

  1. Huygen

  2. Young

  3. Fresnel

  4. Maxwell

Show answer
Correct Option: A
Explanation:

Huygens believed that light was made up of waves vibrating up and down perpendicular to the direction of  the light travels. This is known as 'Huygens' Principle'.  According to this theory, light waves are spherical, and these wave surfaces advance or spread out as they travel at the speed of light. This theory explains why light shining through a pin hole or slit will spread out rather than going in a straight line.

The shape of the nodal curves is 

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

  1. Elliptical

  2. Parabolic

  3. Hyperbolic

  4. Circular

Show answer
Correct Option: C