The bending of a beam of light around comers of an obstacle is called -

The phenomenon of diffraction can be observed, when the obstacle is -

Who first discovered the phenomenon of diffraction 

The occurrence of diffraction pattern depends on 

Light after being a wave motion, appears to travel in straight line because - 

Phenomenon of diffraction occurs - 

Diffraction of light is observed only, when the obstacle size is - 

Diffraction of sound is more evident in daily lifte than light waves, because the than diffraction of light. Because the

If the wave length of a wave is large the degree of diffraction observed is 

The main difference between the phenomena of interference and diffraction is that -

What is necessary for easy occurrence of Fresnel’s diffraction -

The correct relation between the size of the obstacle and the wavelength of light in order to observe the diffraction event is -

In young’s double slit experiment, the diffraction is of the type 

The diffraction effect of light expresses that 

Which colour should be used to increase the resolving power of a microscope - 

Central fringe obtained in diffraction pattern due to a single slit - 

 In the diffraction pattern of a single slit aperture, the width of the central fringe compared to widths of the other fringes, is

What happens, when the width of the slit aperture, is increased in an experiment of single slit diffraction

 In a single slit diffraction pattern, if the light source is used of less wave length then previous one. Then width of the central fringe will be -

The positions of minima in the diffraction pattern due to a single slit are expressed by the formula-

The fringe width in single slit diffraction pattern is proportional to

The condition for obtaining maxima in the diffraction pattern due to a single slit is -

Polarisation of light proves the - 

Waves that cannot be polarised are - 

The angle of incidence at which reflected light is totally polarised for reflection from air to glass (refractive index n) is -

The polaroid glass is used in sunglasses as -

Diffraction of sound is more evident in daily life than light waves, because -

A diffraction pattern is obtained using a beam of red light. What happens if the red light is replaced by the blue light

In propagation of electromagnetic waves the angle between the direction of propagation and plane of polarisation is - 

A beam of light strikes a piece of glass at an angle of incidence of 60º and the reflected beam is completely plane polarised. The refractive index of the glass is -

Two Nicol prism are first crossed and then one of them is rotated through 60º. The percentage of incident light transmitted is - 

If A is the amplitude of the wave coming from a line source at distance r then –

Distance between first and sixth minima in the diffraction pattern of a single slit is 0.5 mm. Screen is 50 cm away from the slit. If slit width is 2.5mm, then wavelength of light used 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 incident beam. For the first minimum of the diffraction pattern the phase difference between the rays coming from the edges of the slit is –

Light of wavelength 6000Å is normally incident on a slit. Angular position of second minimum from central maximum is 30º. Width of the slit should be –

Light of wavelength 5000Å is incident normally on a slit. First minimum of diffraction pattern is formed at a distance of 5mm from the central maximum. If slit width is 0.2 mm, then distance between slit and screen will be – 

Angular width of central maximum in the Franuhoffer's diffraction pattern is measurred. Slit is illimunuated by the light of wavelength 6000Å. If the slit is illuminated by light of another wavelength. Angular width decreased by 30%. Wavelength of light used is –