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Quiz 1
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Q.1
In x lenses are used in Fraunhofer diffraction and y in Fresnel Diffraction, x – y is ________
a) 0
b) 1
c) 2
d) 3
Q.2
The incident wavefronts in Fresnel and Fraunhofer Diffraction are respectively _________
a) Planar and Planar
b) Planar and cylindrical
c) Cylindrical and Planar
d) Cylindrical and Cylindrical
Q.3
The diffraction patterns obtained in Fresnel and Fraunhofer Diffraction are fixed in position.
a) True
b) False
Q.4
What is the variation in the pattern observed for single slit Fresnel diffraction than single slit Fraunhofer Diffraction?
a) The pattern is not hyperbolic
b) The fringes are too thin
c) The region of minimum intensity is not completely dark
d) The fringes are colored
Q.5
The diffraction pattern changes downstream in Fresnel Diffraction.
a) True
b) False
Q.6
The surface of calculation for Fraunhofer and Fresnel diffraction patterns are respectively __________
a) Flat and Flat
b) Spherical and Flat
c) Flat and Spherical
d) Spherical and Spherical
Q.7
Light ofÅ is incident on a circular hole of radius 3 cm. How many half-period zones are contained in the circle if the screen is placed at a distance of 0.5 m?
a) 25
b) 250
c) 2500
d) 25000
Q.8
What does the figure show?
a) Diffraction underwater
b) Diffraction in a magnetic field
c) Cornu’s Spiral
d) Diffraction at a straight edge
Q.9
In Fresnel diffraction, the relative phase difference between the curved wavefront is ________
a) Constant
b) Zero
c) Linearly increasing
d) Non=constant
Q.10
The following intensity variation graph is for _____________
a) Single slit Diffraction
b) Double slit diffraction
c) Edge Diffraction
d) Cornu’s Spiral
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