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
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
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
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
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
Two sodium lamps are used in an interference experiment. The intensity produced by both lamps individually on the screen is I. The ratio of intensity of maxima to intensity of minima on the screen is
2:1
1:2
∞:1
1:1
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
The maximum number of possible interference maxima for slit-separation equal to twice the wavelength in Young's double slit experiment, is
three
five
infinite
zero
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
Light appears to travel in a straight line because
wavelength of light is very small
frequency of light is very small
light consists of very small particles
velocity is different for different colours