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(a) 4:1(b) 3:1(c) 2:1(d) 1:1Solution: (b)Let the amplitude ratio be x/y.Ratio of maximum and minimum is [(x+y)/(x-y)]2 which is equal to... View Article

The maximum number of possible interference maxima for slit separation equal to twice the wavelength is Young’s double-slit experiment, is

(a) Infinite(b) Five(c) Three(d) ZeroSolution: (b)In Young's double slit experiment, the condition for maxima is dsinθ = nλ.Where d = separation... View Article

On introducing a thin film in the path of one of the two interfering beams, the central fringe will shift by one fringe width. If μ =1.5, the thickness of the film is (wavelength of monochromatic light is λ)

(a) 4λ(b) 3λ(c) 2λ(d) λSolution: (c)Shift in central bright = (μ-1)tD/dAgain, λD/d = (μ-1)tD/dλ = (μ-1)tor t = λ/(μ-1) = λ/1.5 = 2λ... View Article

To demonstrate the phenomenon of interference we require two sources, which emits radiations of

(a) Two sources which emit radiation of same frequency(b) Two sources which emit radiation of nearly same frequency(c) Two sources which emit... View Article

In young’s double slit experiment, the ratio of intensities of bright and dark bands is 16 which means:

(a) The ratio of their amplitude is 5.(b) Intensities of individual sources are 25 and 9 units respectively.(c) The ratio of their amplitudes is... View Article

In an interference experiment, the spacing between successive maxima or minima is

(a) μd/D(b) λD/d(c) dD/λμ(d) μλd/4DAnswer: (b)Hint: maxima = x = nλD/d and minima = x = (n+1)λD/dso, the difference between maxima and minima is λD/d... View Article

In a Young’s double slit experiment, constructive interference is produced at a certain point P. The intensities of light at P due to the individual sources are 4 and 9 units. The resultant intensity at point P will be

(a) 13 units(b) 25 units(c) √97 units(d) 5 unitsSolution:Answer: (b) 25 unitsI1 = 4 and I2 = 9 (Given)Intensity of light = IR = I1 + I2 + 2√I1I2... View Article

Light of wavelength 6000 A falls on a single slit of width 0.1 mm. The second minimum will be formed for the angle of diffraction of

(a) 0.06 rad(b) 0.05 rad(c) 0.12 rad(d) 0.012 radSolution:Answer: (d)Wavelength = λ = 6000 = 6 x 10-7 md = 0.1 x 10-3 mn = 2The angle of... View Article

In Young’s double slit experiment, a third slit is made in between the double slits. Then,

(a) fringes of unequal width are formed.(b) contrast between bright and dark fringes is reduced.(c) intensity of fringes totally disappears.(d)... View Article

If the fringe width is 0.4mm, the distance between the fifth bright and third dark band on the same side is.

(a) 1mm(b) 2mm(c) 3mm(d) 4mmSolution: Answer: (a) 1mmPosition of nth bright fringe from central maxima is xn' = n'λD/d, here n' = 5So, xn' =... View Article

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