The shape of wave front emitted by a light source in the form of a narrow slit is

What is a Wave front ?

What is the shape of wavefront orginating fron a line source?

What is the shape of wave front originating from a point source

A point source of light B,placed in front of the centre of a mirror of width d,hangs vertically on a wall.A man walds in front of the mirror along a line parallel to the mirror at a distance 2L from it as shown in the figure.The gretest distance over which he can see the image of the light source in the mirror is

A parallel monochromatic beam of light is incident normally on a narrow slit.A diffraction pattern is formed on a screen placed perpendicular to the direction of the incident beam.At the first minimum of the diffraction pattern,the phase difference between the rays coming from the two edges of the slit is

What is the shape of the wavefront in each of the following cases:Light diverging from a point source.

In the wave picture of light, intensity of light is determined by square of the amplitude of wave. What determines the intensity of light in the photon picture of light.