wave optics

If a plane wavefront is incident on a concave mirror, then the emergent wavefront will be _________ of the mirror as its centre.

• conical with focus

• spherical with focus

• spherical with centre of the curvature of the surface

• conical with centre of the curvature of the surface

The energy of the wave travels in a direction _____________ to the wavefront.

_______ principle says that each point of the wavefront is the source of a secondary disturbance and the wavelets emanating from these points spread out in all directions with the speed of the wave.

• Rayleigh

• Maxwell

• Huygens

• Hertz

According to Huygens principle of secondary wavelets, each particle at a wave front

• is an electron

• behaves as a photon

• represents the direction of the motion of wave front

• behaves as a new light source

The spherical wave front is received

• near the Sun

• near a lighting tube-light

• when the light wave is coming from Sun to Earth

• all of the above

The direction of wave front of a wave with the difference of propagation of wave is

• parallel

• perpendicular

• opposite

• at angle

A wave front is an imaginary surface where

• all particles lying on this vibrate in opposite phase

• some particles in same phase and some in opposite phase

• all particles lying on this vibrate in same phase

• none of these

The phenomenon of diffraction can be understood using

• Fraunhofer

• Uncertainty principle

• Fresnel

• Huygens principle

Wave front is a imaginary surface, where

• everywhere phase is equal

• phase difference are equal

• phase difference is different

• none of these

A wavefront is defined as a surface of ________ phase.

• constant

• increasing

• decreasing

• time variable