A linear aperture whose width is 0.02 cm is placed immediately in front of a lens of focal length 60 cm. The aperture is illuminated normally by a parallel beam of wavelength 5×10⁻⁵ cm. The […]
In Young’s double slit interference experiment, using two coherent waves of different amplitudes, the intensities ratio between bright and dark fringes is 3. Then, the valule of the wave amplitudes ratio heat arrive there is […]
The polarising angle of glass is 57⁰. A ray of light which is incident at this angle will have an angle of refraction as
Options
(a) 43⁰ (b) 25⁰ (c) 38⁰ (d) 33⁰
Correct […]
In Young’s double slit experiment, the ratio of maximum and minimum intensities in the fringe system is 9:1. The ratio of amplitudes of coherent sources is
Options
(a) (9:1) (b) (3:1) (c) (2:1) […]
A plane wave of wavelength 6250Å is incident normally on a slit of width 2×10⁻² cm. The width of the principal maximum of diffraction pattern on a screen at a distance of 50cm will be […]
White light reflected from a soap film (Refractive Index =1.5) has a maxima at 600 nm and a minima at 450 nm with no minimum in between. Then, the thickness of the film is
Two coherent sources of intensity ratio α interfere. In interference pattern, Imax – Imin/ Imax+ Imin is equal to
Options
(a) 2α/1+α (b) 2√α/1+α (c) 2α/1+√α (d) 1+α/2α
Correct Answer:
2√α/1+α
Explanation:
No […]
In Young’s double slit experiment, the fringe width is 1×10⁻⁴ m, if the distance between the slit and screen is doubled and the distance between two slits is reduced to half and the wavelength is […]
In Young’s double slit experiment, the locus of the point P lying in a plane with a constant path difference between two interfering waves is
Options
(a) a hyperbola (b) a straight line […]
A plane polarised light is incident normally on a tourmaline plate. Its E vector make an angle of 60⁰ with the optic axis of the plate. Find the percentage difference between initial and final intensities […]
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