Two interfering beams have intensities in the ratio of 9:4. Then the ratio of maximum to minimum intensity in the interference pattern is (A) 25:1 (B) 13:5 (C) 5:1 (D) 3:2

A phase difference of 5π corresponds to a path difference (in terms of λ) of: (a) 5λ (b) 10λ. (c) 5λ/2 (d) 2λ

A plane wave passes through a convex lens. The geometrical shape of the wavefront that emerges is (a) plane (b) diverging spherical (c) converging spherical (d) None of these

In a Young’s double slit experiment the distance between the slit is 1 mm and the distance of screen from the slit is 1 m. If light of wavelength 6000 A is used then the fringe width is: (a) 0.4 mm (b) 0.5 mm (c) 0.6 mm (d) 0.8 mm

In Young’s double slit experiment the distance between the slit and the screen is doubled and the separation between the slit is reduced to half. The fringe width: (a) is doubled (b) become four time (c) is halved (d) remain unchanged

In Young’s double slit experiment, the central point on the screen is: (a) bright (b) dark (c) first bright and later dark (d) first dark and later bright

The fringe width (β) of a diffraction pattern and the slit width d are related as: (a) β ∝ d (b) β ∝1/d (c) β ∝ √d (d) β ∝ 1/\(d^2\)

The locus of all particles in a medium, vibrating in the same phase is called (a) wavelet (b) fringe (c) wave front (d) None of these

The locus of all the points vibrating in same phase of oscillation is called (A) Wavelet (B) Wavefront (C) Wavetrain (D) Rays

The phenomena which is not explained by Huygen’s construction of wavefront (a) reflection (b) diffraction (c) refraction (d) origin of spectra

Which of the following is conserved when light waves interfere? (a) phase (b) intensity (c) amplitude (d) none of these

A single slit diffraction pattern is obtained using a beam of red light What happened if the red light is replaced by the blue light? (a) There is no change in diffraction pattern (b) Diffraction fringes become narrower and crowded (c) Diffraction fringes become broader and farther apart (d) The diffraction pattern disappear

An unpolarised beam of intensity \(I_0\) is incident on a pair of nicols making angle of 60° with each other. The intensity of right emerging from the pair is

For sustained interference, we need two sources which emit radiations: (a) of the same intensity (b) of the same amplitude (c) having a constant phase difference (d) None of these

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