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