Ray Optics Test...

The width of a single slit, if the first minimum is observed at an angle of 2^o with a wavelength of light 6980 Å is __________mm

In a fraunhofer diffraction by single slit of width d with incident light of wavelength 5500 Å the first minimum is observed at angle of 30 . The first secondary maximum is observed at an angle θ = _________.

The phenomenon of polarisation of electromagnetic waves proves that the electromagnetic waves are_______.

Light from two coherent Sources of the same amplitude A and wavelength λ , illuminates the Screen. The intensity of the central maximum is I_o. If the sources were incoherent, the intensity at the same point will be__________.

When the angle of incidence is 60^o on the Surface of a glass slab, it is found that the reflected ray is completely polarised. Then the velocity of light in glass is______________ms^–1

Two beams of Light of intensity I₁ and I₂ interfere to give an interference pattern. If the ratio of maximum intensity to that of minimum intensity is 16/4 then I₁/I₂ = ____________________

Two beams of light having intensities I and 4I interfere to produce a fringe pattern on a screen. The phase difference between the resultant intensities at A and B is____________.

Which of the following phenomenon is used in optical fibres ?

A sound source emits sound of 600 Hz frequency, this sound enters by opened door of width 0.75 m. Find the angle on one side at which first minimum is formed. The speed of sound = 300ms^–1 .