Previous Year Question on Wave Optics for JEE & BITSAT Exams

Question 1

What happens to the fringe pattern if in the path of one of the slits a glass plate which absorbs 50% energy is introduced -

Question 2

The Young's double slit experiment is performed with blue and with green light of wavelengths 4360 Å and 5460 Å respectively. If X is the distance of 4^th maximum from the central one, then -

Question 3

A double slit is illuminated by two wavelengths 450 nm and 600 nm. What is the lowest order at which minima of 600 nm wavelength coincide with maxima of 450 nm?

Question 4

In a two slit experiment with white light, a white fringe is observed on a screen kept behind the slits. When the screen is moved away by 0.05 m, this white fringe -

Question 5

The double slit experiment of Young has been shown in figure. Q is the position of the first bright fringe on the right side and P is the 11^th bright fringe on the other side as measured from Q. If wavelength of the light used is 6000 Å, S₁B, will be equal to -

Question 6

In a Biprism experiment, if the wavelength of red light used is 6.5 × 10^–7 m and that of green is 5.2 × 10^–7 m, the value of n for which (n + 1)^th green bright band coincides with the n^th red bright band for the same setting is given by -

Question 7

In a YDSE experiment if a slab whose refractive index can be varied is placed in front of one of the slits then the variation of resultant intensity at mid-point of screen with ‘μ’ will be best represented by (μ ≥1). [Assume slits of equal width and there is no absorption by slab]

Question 8

To observe a stationary interference pattern formed by two light waves, it is not necessary that they must have -

Question 9

In a 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 (in mm) will be -

Question 10

The central fringe of the interference pattern produced by light of wavelength 6000 Å is found to shift to the position of 4th bright fringe after a glass plate of refractive index 1.5 is introduced in path of one of beams. The thickness of the glass plate (μm) in would be -