Wave Optics Tes...

The shape of wave front at a very large distance from source is ______

Which of the following is wrong for interference fringes?

An observer is moving with half the speed of light towards a stationary microwave source emitting waves at frequency 10 GHz. What is the frequency of the microwave measured by the observe? (speed of light=$$3\times { 10 }^{ 8 }\ m{s}^{ -1 }$$

Sound waves in air cannot be polarized because :

The angular spread of central maximum, in the diffraction pattern, does not depend on ______

Which of the following is correct for light diverging from a point source ?

The diameter of objective of a telescope is $$1m$$. Its resolving limit for the light of wavelength $$4538\overset {\circ}{A}$$, will be :

A double slit is illuminated by light of wave length 6000$$A ^ { 0 }$$.The slits are 0.1 cm apart and the screen is placed 1 m away. Then the angular position of 10th maxima is

If a star emitting yellow light is accelerated towards earth, then to an observer on earth it will appear?

The wavelength of light visible to eye is of the order of