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.

• similarly

• oppositely

• perpendicularly

• none

_______ 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

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

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

The shape of waverfront for a light emerging out of a convex lens when a point source is placed at its focus

• Plane wavefront

• Soherical wavefront

• cylindrical wavefront

• none

The characteristics of wave which does not change after refraction is

• Wavelength

• Velocity

• Frequency

• none

The disturbance that travelling through medium or vacuum from one place to other by transferring the energy. That sentence is definition for......

• Wave

• Vibration

• Medium

• Oscillation