Interference was first observed in the interference chamber,when air was present, now the chamber is evacuated, and if the same light isused then a careful observer will see:

Huygens’s wave theory of light cannot explain 

Wave optics is valid when characteristic dimensions are 

Ray optics is valid when the characteristic dimensions are

Interference pattern is obtained on a screen due to two identical coherent sources of monochromatic light. The intensity of the central bright fringe is 1. When one of the sources is blocked, its intensity becomes I₀.The intensity in two situations is related as:

If a source of light is moved away from a stationary observer, then the frequency of light wave appears to change because of:

When seen in green light, the saffron and green portions of our National Flag will appear.

Light travels through a glass plate of thickness t andhaving a refractive index µ. If c be the velocity of light in vaccum, the timetaken by light to travel this thickness of glass is

In Young’s Double Slit experiment using sodium light (λ =5898 Å), 92 fringes are seen. If green colour (5461 Å) is used, how many fringes will be seen?

Young’s experiment established that:

The condition for observing Fraunhoffer diffraction from asingle slit is that the light wave front incident on the slit should be:

Which of the following establishes the transverse nature of light.

Light appears to travel in straight line since 

If n represents the order of a half period zone, the area ofthis zone is nearly proportional to n^m. where m is equal to

Two coherent monochromatic light beams of intensities I and 4I are superimposed. The maximum and minimum possible intensities in the resulting beam are

Two waves, originating from sources S₁ and S₂ havingzero phase difference and common wave length λ, will show completely destructive interference at a point Pif (S₂P – S₁P) is

The principle of super position in wave motion tells that in a motion in which two or more waves are simultaneously producing their displacement in a particle, then the resultant: 

A diffraction pattern is obtained by using a beam of redlight. What will happen if the red light is replaced by the blue light?

Interference takes place due to 

The frequency of e.m. wave which is best suited to observe aparticle of radius 3 × 10^-4 cm is of the order of

One important similarity between sound and light waves isthat both:

Two waves of the same frequency and same intensity are superimposed in the same phase. The intensity of the resultant wave at the Central point will be 

What happens if one of the slits, say S₁ inYoung’s double, slit experiment-is covered with a glass plate which absorbs half the intensity of light from it?

What happens to the interference pattern the two slits S₁ and S₂ in Young’s double experiment are illuminated by two independent but identical sources?

A single slit diffraction patternis obtained using a beam of red light what happened the red light is replaced by the blue light?

When a Polaroid is rotated, the intensity of light varies but never reduces to zero. It shows that the incidentlight is:

When a Polaroid is rotated, theintensity of light does not vary. The incident light may be:

In Young’s double slitexperiment, a maximum is obtained when the path difference between the interfering waves is (n ∈ l):

For sustained interference, we need two sources which emit radiations: 

Two sources of light are said to be coherent when both give out light waves of the same: 

The intensity of light emerging from the two slits, in Young’s experiment is in the ratio 1: 4. The ratio of,the intensity of the minimum to that of the consecutive maximum will be:

Poisson’s bright spot was discovered by:

The theory of expanding universe is confirmed by the observation of the spectral lines of the star, which shows:

The application of Doppler effect are:

Which of the following is conserved when light waves interfere?

In Young double slit experiment, a minimum is obtained when the phase difference of the superposing waves, is (n∈ l):

The angle of minimum deviation of a prism depends upon the aggie of:

The minimum value of the refractive index is:

Polarization of light prove the :