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 the 4th maxima from the central one, then
x(blue) = x(green)
x(blue) > x(green)
x(blue) < x(green)
x(blue) / x(green) = 5460/4360
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
Which of the following phenomenon is not common to sound and light waves?
interference
diffraction
coherence
polarisation
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 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
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
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
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
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 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
