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JEE 2020 Physics: Wave Optics Quiz 2 (28.08.2019)
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Question 1
A light of wavelength 
passing through with plane diffraction grating which has 1200 Lines per cm. The upper limit on the order of diffraction maxima that can possibly see with this arrangement is close to
passing through with plane diffraction grating which has 1200 Lines per cm. The upper limit on the order of diffraction maxima that can possibly see with this arrangement is close to Question 2
Red light of wavelength 625 nm is incident normally on an optical diffraction grating with 
lines/ m. Including central principal maxima, how many maxima may be observed on a screen which is far from the grating?
lines/ m. Including central principal maxima, how many maxima may be observed on a screen which is far from the grating?Question 3
In Fraunhauffer diffraction from a single slit of width 0.3 mm the diffraction pattern is formed in the focal plane of a lens of focal length 1 m. If the distance of third minimum from the central maximum is 6 mm, then find the wavelength of light used.
Question 4
In the diffraction from a single slit of width 
the total number of minimas and secondary maximum (maxima) on either side of the central maximum are
the total number of minimas and secondary maximum (maxima) on either side of the central maximum areQuestion 5
A single slit of width b is illuminated by a coherent monochromatic light of wavelength λ. If the second and fourth minima in the diffraction pattern at a distance 1 m from the slit are at 3 cm and 6 cm respectively from the central maximum, what is the width of the central maximum? (i.e. distance between first minimum on either side of the central maximum)
Question 6
A diffraction grating of length 
is illuminated by a light with two wavelengths 
and 
. The maximum size of the grating element 
required to resolve the two wavelengths in the first order is
is illuminated by a light with two wavelengths and . The maximum size of the grating element required to resolve the two wavelengths in the first order is Question 7
A parallel beam of light of wavelength 6000 Å gets diffracted by a single slit of width 0.3 mm. The angular position of the first minima of diffracted light is
Question 8
A fringe width of a certain interference patterns is β = 0.002 cm. What is the distance of 5th dark fringe from centre?
Question 9
In Young's double slit experiment, the intensity of light at a point on the screen where the path difference is λ = I. The intensity of light at a point where the path difference becomes λ / 3 is
Question 10
White light reflected from a soap film (Refractive index=1.5) has a maxima at 600nm and a minima at 450 nm with no minimum in between. Then the thickness of the film is _______×10-7 m.
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