Huygen's principle

What is 90 degrees in radians? 

• π/4
• π/2
• π/6
• 3π/2

This image is representing what wave interaction?

• Refraction
• Diffraction
• Reflection
• Interference

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

• True

• False

How much is the phase difference corresponding to path difference of ƛ of two waves reaching a point?

• 2π

• 0

• π

• none of above

What is the phase difference between two points on a wavefront?

• π

• 2π

• 0

• none of these

What is shape of wavefront when point source is far away?

• cylindrical

• spherical

• plane

• not defined

Light waves travelling through air strike the surface water at an angle. Which of the following statements is correct?

• The light speed, frequency and wavelength all stay the same

• The light speed, frequency and wavelength all change

• The light speed and frequency change, but the wavelength stays the same

• The light wavelength and speed change but frequency stays the same

According to huygen's principle,light is a form of

• particle

• rays

• wave

• none of the above

The frequency and wavelength of wave striking reflecting medium is 2x10¹⁴Hz and 3000A^o. What will be its frequency after reflection?

• 10¹⁴ Hz

• 2 x 10¹⁴Hz

• 3x10¹⁴Hz

• none of the above

Huygen’s principle of secondary wavelets may be used to

• find the velocity of light in vacuum              

• explain the particle behaviour of light

• find the new position of a wave front

• none of these