A thin film of soap solution (n=1.4) lies on the top of a glass plate (n=1.5). When visible light is incident almost normal to the plate, two adjacent reflection maxima are observed at two wavelengths […]
In Young’s experiment, the third bright band for light of wavelength 6000Å coincides with the fourth bright band for another source of light in the same arrangement. Then the wavelength of second source is
An unpolarised beam of intensity I₀ falls on a polaroid. The intensity of the emergent light is
Options
(a) I₀/4 (b) zero (c) I₀/2 (d) I₀
Correct Answer:
I₀/2
Explanation:
When unpolarised beam […]
In Young’s double slit experiment, a third slit is made in between the double slits. Then
Options
(a) fringes of unequal width are formed (b) contrast between bright and dark fringes is reduced […]
If the ratio of amplitude of two superposed waves is 2:1, then the ratio of maximum intensity and minimum intensity is
Options
(a) (9:1) (b) (1:9) (c) (4:1) (d) (1:4)
Correct Answer:
(9:1)
Explanation: […]
If seperation between screen and source is increased by 2%. What would be the effect on the intensity?
Options
(a) increases by 4% (b) increases by 2% (c) decreases by 2% (d) decreases […]
A single slit Fraunhogger diffraction pattern is formed with white light. For what wavelength of light the third secondary maximum in the diffraction pattern coincides with the second secondary maximum in the pattern for red […]
In Young’s double slit experiment with sodium vapour lamp of wavelength 589 nm and the slits 0.589 mm apart, the half angular width of the central maximum is
Options
(a) sin⁻¹ 0.01 (b) sin⁻¹ […]
Two point white dots are 1 mm apart on a black paper. They are viewed by eye of pupil diameter 3 mm. Approximately, what is the maximum distance at which these dots can be resolved […]
When the speed of electron beam used in Young’s double slit experiment is increased, then which among the following statements is correct?
Options
(a) Interference pattern will not be observed in case of […]
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