In Young's double slit experiment, let S1 and S2 be the two slits, and C be the centre of the screen. If∠S1CS2 = θ and λ is the wavelength, the fringe width will be
λ/θ
λ θ
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
1/2
3/4
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, the seventh maximum with wavelength λ1 is at a distance d1 and the same maximum with wavelength λ2 is a distance d2. Then d1/d2
Specific rotation of sugar solution is 0.01 rad-m2 / kg. If 200kg/m3 of impure sugar solution is taken in a polarimeter tube of length 0.25m and an optical rotation of 0.4 rad is observed, then the percentage of purity of sugar in the sample is :
11%
20%
80%
89%
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 of wavelength 6328 is incident on a slit having a width 0.2 mm. The width of the central maximum, measured from minimum to minimum is:
0.36 degrees
0.18 degrees
0.72 degrees
0.09 degrees
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