In Young's experiment, the ratio of maximum and minimum intensities in the fringe system is 9:1. The ratio of amplitudes of coherent sources is
9 :1
3 :1
2 :1
1 :1
A beam of ordinary unpolarised light passes through a tourmaline crystal C1 and then it passes through another tourmaline crystal C2 which is oriented such that its principle plane is parallel to that of C2. The intensity of emergent light is I0. Now, C2 is rotated by 60o about the ray. The emergent ray will have an intensity
2 I0
I0 / 2
I0 / 4
I0 / √2
The velocity of light in diamond, glass and water decreases in the following order:
water > glass > diamond
diamond > glass > water
diamond > water > glass
water > diamond > glass
In a Young's double slit experiment the intensity at a point where the path difference is λ/6 (λ being the wavelength of the light used) is I. If I0 denotes the maximum intensity. I/I0 is equal to
1/√2
√3/2
½
¾
A thin transparent sheet is introduced in front of a Young's double slit experiment. The fringe width will
increase
decrease
remain the same
become non-uniform
Which of the following phenomenon is not common to sound and light waves?
interference
diffraction
coherence
polarisation
If a star is moving towards earth,then the lines are shifted towards
red
infrared
green
blue
Two coherent light sources S1 and S2 (λ = 6000 Å) are 1 mm apart from each other. The screen is placed at a distance of 25 cm from the sources. The width of the fringes on the screen should be
0.015 cm
0.025 cm
0.010 cm
0.030 cm
The resolution limit of the eye is 1. At a distance of x km from the eye, two persons stand with a lateral separation of 3 metres. For the two persons to be just resolved by the naked eye, x should be
10 km
15 km
20 km
30 km
In Young's double slit experiment using red and blue lights of wavelengths 600 nm and 480 nm respectively, the value of n for which the nth red fringe coincides with (n + 1)th blue fringe is