In a YDSE experiment a monochromatic source of light is used. The shape of the interference fringes formed on a screen is I. Parabola II. Hyperbola III. Straight line IV. Circle

In the diffraction pattern due to single slit, at the position of 2nd maximum the path difference between the wavelets from the opposite edges of the slit is I. 5λ/2 II. 3λ/2 III. 2λ IV. λ

In the phenomenon of diffraction of light, when blue light is used in the experiment instead of red light, then i. Fringes will become narrower ii. Fringes will become broader iii. No change in fringe width iv. None of the above

Two sources of intensity I and 4I are used in an interference experiment . Find the intensity at points where waves from two sources superimpose with phase difference π/2 is I. 4I II. 6I III. 5I IV. 9I

Two waves having intensities in the ratio of 9:1 produce interference. The ratio of the maximum to the minimum intensity is I. 9:1 II. 4:1 III. 1:2 IV. 1:3

When a compact disc is illuminated by a source of white light , colored lines are observed. This is due to I. Interference II. Diffraction III. Dispersion IV. Refraction

A screen is placed 50m from a single slit, which is illuminated with 6000Å light. If the distancebetween the first and third minima in the diffraction pattern is 3.00mm, what is the width of the slit ? i. 200 µm ii. 300 µm iii. 250 µm iv. 350 µm

How does the angular separation between fringes in single slit diffraction experiment change when the distance of separation between the slit and screen is doubled? i. Becomes twice ii. Remains same iii. Becomes half iv. Becomes one-fourth

How does the fringe width alter, if the entire Young’s double slit experimental set up is completely immersed into water ? I. Increases II. Decreases III. Remains same IV. None of these

In Young’s double slit experiment, the fringe width is found to be 0.4 mm. If the whole apparatus is immersed in water of refractive index 4/3 without disturbing the geometrical arrangement, the new fringe width will be : i. 0.3 mm ii. 0.4 mm iii. 0.53 mm iv. 0.75 mm

In Young’s double slit experiment, using sodium light (λ = 5898) , 92 fringes are seen. If given colour (λ= 5461) is used, how many fringes will be seen? I. 67 II. 95 III. 99 IV. 84

The interference phenomenon takes place I. In all waves II. In transverse waves only III. In longitudinal waves only IV. In standing waves only

What type of wave front will emerge from any distant source of light? i. Spherical wave front ii. Cylindrical wave front iii. Plane wave front iv. None of these

When tiny circular obstacle is placed in the path of light from a distance source , a bright spot is seen at the centre of the obstacle. I. It happens due to II. Polarization of light waves III. Diffraction of light waves IV. Interference of light waves V. Scattering of light waves

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) The intensity of the bright fringes doubled (b) The intensity of the bright fringes becomes four times (c) Two sets of interference fringes overlap (d) No interference pattern is observed