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mcq on X Ray Diffraction. We covered all the mcq on X Ray Diffraction in this post for free so that you can practice well for the exam.
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mcq on X-Ray Diffraction for Students
Which statements are true regarding an achromatic doublet slit?
a) The resultant power of the doublet is always positive
b) The lenses used have different focal lengths and optical powers
c) The focal lengths are inversely related to their respective powers
Option b – The lenses used have different focal lengths and optical powers
An optical system is considered aplanatic when it is free from
a) Spherical aberration
b) Coma
c) Neither spherical nor coma
d) Both a and b
Option b – Both a and b
Huygens eye-piece eliminates both spherical and chromatic aberrations
a) True
b) False
c) Cannot be determined
d) None of the above
Option a – True
In the Huygens eye-piece, if the focal lengths of the lenses are 3f and f, the distance between them is
a) f
b) 2f
c) f/2
d) 4f
Option b – 2f
A compound achromatic lens of 40 cm focal length is made using crown glass (dispersive power 0.21) and flint glass (0.46). What are the focal lengths of the components?
a) Crown = 21.71 cm
b) Flint = -47.62 cm
c) Crown = -21.71 cm, Flint = -47.62 cm
d) Crown = -21.71 cm, Flint = 47.62 cm
Option d – Crown = -21.71 cm, Flint = 47.62 cm
A concave lens of -20 cm focal length is placed in contact with a convex lens of +10 cm. What is the resulting focal length of the system?
a) -20 cm
b) -10 cm
c) 20 cm
d) 2 cm
Option c – 20 cm
In any medium, Light travels between two points in such a way that
a) The transit time is minimum
b) energy loss is minimized
c) Dispersion is minimized
d) None of the above
Option a – The transit time is minimum
Two lenses with focal lengths 10 cm and 20 cm and dispersive powers 0.015 and 0.027 form an achromatic doublet. What should be the separation between them?
a) 18.5 mm
b) 10.5 cm
c) 13.5 cm
d) 5.5 cm
Option c – 13.5 cm
Soap bubbles show colors due to
a) Polarization
b) Interference
c) Dispersion
d) Diffraction
Option c – Dispersion
Blurred shadows occur due to the phenomenon of
a) Interference
b) Diffraction
c) Polarization
d) Resolution
Option b – Diffraction
The Diffraction fringes at the edge of a pattern are
a) Equally spaced
b) Unequally spaced
c) May or may not be equally spaced
d) None of these
Option b – Unequally spaced
Light appears to travel in straight lines because
a) Due to particles in the path
b) Due to high speed of Light
c) Because of its small wavelength
d) Due to reflection from surfaces
Option c – Because of its small wavelength
How does the area of the second half-period zone compare with the first in a zone plate?
a) S₂ = 2S₁
b) S₂ = -S₁
c) S₂ = S₁
d) S₂ = S₁ / 2
Option c – S₂ = S₁
Which condition is essential to observe Diffraction?
a) Narrow slit
b) A screen
c) Monochromatic Light
d) White Light
Option a – Narrow slit
A narrow vertical slit lit with 6000 Å Light casts a shadow of a 2 mm wire, 1 m away from a screen at 3 m. Find the fringe separation.
a) 0.009 cm
b) 0.09 cm
c) 0.1 cm
d) None of the above
Option b – 0.09 cm
A monochromatic beam is incident normally on a narrow slit, forming a Diffraction pattern. What is the phase difference at the first minimum?
a) 3π
b) 2π
c) π/2
d) 0
Option b – 2π
In a single slit Diffraction experiment, yellow Light is replaced with X-rays. What will be observed?
a) More fringes
b) No pattern
c) Fewer fringes
d) None of the above
Option b – No pattern
As a wave spreads out:
a) Intensity falls as the square of the distance for a spherical wave
b) Intensity falls linearly with distance for spherical waves
c) Total wave intensity over the sphere stays constant
d) Both a and c
Option d – Both a and c
How does relativistic Mass behave with increasing speed?
a) Decreases
b) Increases
c) Remains unchanged
d) None of the above
Option b – Increases
Energetic particles sometimes exceed the speed of Light in a medium. What phenomenon results?
a) Cosmic radiation
b) X-ray emission
c) Electromagnetic waves
d) Ultraviolet rays
Option a – Cosmic radiation
What is the radius of the first zone in a zone plate with 0.2 m focal length for 5000 Å Light?
a) 0.0316 m
b) 0.0316 cm
c) 0.021 m
d) 1 cm
Option b – 0.0316 cm
In white Light diffraction, the maximum diffraction angle occurs for which color?
a) Violet
b) Blue
c) Yellow
d) Red
Option d – Red
The resolving power of a microscope is enhanced by increasing
a) Wavelength
b) Refractive index of the medium
c) Object size
d) Length of microscope
Option b – Refractive index of the medium
The resolving power of a prism improves with
a) Base width
b) Prism angle
c) Prism Base
d) Prism height
Option a – Base width
The resolving power of a grating increases with
a) Line density
b) Total number of lines
c) Grating width
d) Type of source
Option b – Total number of lines
Circular spots seen under trees from sunlight are due to
a) Interference
b) Diffraction
c) Polarization
d) None
Option b – Diffraction
In which phenomenon does measurement not depend on the light’s wavelength?
a) Interference
b) Diffraction
c) Polarization
d) Rectilinear propagation
Option c – Polarization
What property is common to both sound and light waves?
a) Interference only
b) Diffraction only
c) Polarization only
d) Both interference and diffraction
Option d – Both interference and diffraction
If red light in a diffraction setup is replaced by blue, what happens to the fringe pattern?
a) No change
b) Pattern disappears
c) Bands move closer and become narrower
d) None of these
Option c – Bands move closer and become narrower
The shape of half-period zones in a cylindrical wavefront is
a) Irregular
b) Spherical
c) Rectangular
d) Circular
Option c – Rectangular
The radii of rings on zone plates relate to
a) Natural numbers
b) Square roots of natural numbers
c) Squares of natural numbers
d) Cubes of natural numbers
Option b – Square roots of natural numbers
In white light spectra, the longest focal length for a zone plate corresponds to which color?
a) Red
b) Green
c) Yellow
d) Violet
Option d – Violet
What is the light intensity at the dark fringe in Fraunhofer diffraction?
a) Zero
b) Equal
c) Increases
d) Decreases
Option a – Zero
When Fresnel diffraction occurs at a circular aperture, and an odd number of half-period zones reach a point, what is the light intensity there?
a) Zero
b) Minimum
c) Maximum
d) None
Option c – Maximum
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