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
In a certain double slit experimental arrangement, interference fringes of width 1.0 mm each are observed when light of wavelength 5000 Å is used. Keeping the set up unaltered, if the source is replaced by another of wavelength 6000 Å, the fringe width will be
0.5
1.0 mm
1.2 mm
1.5 mm
Diamond has maximum refractive index, hence, velocity of light in diamond is the least. The refractive index of water is the least, hence, in water the velocity of light is maximum.
λ/θ
λ θ
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
Which of the following phenomenon is not common to sound and light waves?
interference
diffraction
coherence
polarisation
A slit of width a is illuminated by white light. The first minimum for red light will fall at 30o, when a is
3250 Å
6.5 × 10-4 mm
1.3 micron
2.6 x 10-4 mm
Two points separated by a distance of 0.1 mm can just be inspected in a microscope when light of wavelength 6000 Å is used. If the light of wavelength 4800 Å is used, this limit of resolution will become
0.80 mm
0.12 mm
0.10 mm
0.08 mm
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
Air has a refractive index 1.0003. The thickness of air column, which will have one more wavelength of yellow light (6000 Å) than in the same thickness in vacuum is
2 mm
2 cm
2 m
2 km
If a star is moving towards earth,then the lines are shifted towards
red
infrared
green
blue
