What do you mean by coherent sources?

Two sources of waves are called coherent if the phase difference between them is constant, i.e. independent of time and waves have the same frequency. Waves coming from two independent sources can not be coherent. Two real or virtual sources produced by the single source are coherent. When the waves are coherent, then only interference occurs.

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Gamma Question Bank for Medical Physics>Chapter 27 - Wave Optics>Assigment>Q 18

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In a Young's double slit experiment, the intensity at the central maximum is $I_{0} .$ The intensity at a distance $β / 4$ from the central maximum is( $β$ is fringe width)

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Important Questions on Wave Optics

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Gamma Question Bank for Medical Physics>Chapter 27 - Wave Optics>Assigment>Q 19

White light is used to illuminate the two slits in Young's experiment. The separation between the slits is

b

and the screen is at a distance

d (> > b)

from the slits. At a point directly in front of one of the slits, certain wavelengths are missing. The missing wavelength(s) is/are

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Gamma Question Bank for Medical Physics>Chapter 27 - Wave Optics>Assigment>Q 20

Dark and colour patterns on thin soap films are due to

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Gamma Question Bank for Medical Physics>Chapter 27 - Wave Optics>Assigment>Q 21

Choose the correct statement.

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Gamma Question Bank for Medical Physics>Chapter 27 - Wave Optics>Assigment>Q 22

The beautiful iridescent (like a rainbow) colors on the wings of a tropical or morpho butterfly are due to

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Gamma Question Bank for Medical Physics>Chapter 27 - Wave Optics>Assigment>Q 23

Some currency notes (to avoid counterfeits) change their colour as you tilt them. This is due to

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Gamma Question Bank for Medical Physics>Chapter 27 - Wave Optics>Assigment>Q 24

A parallel beam of monochromatic light of wavelength

5000 \overset{°}{A}

is incident normally on a single narrow slit of width

0.001 mm

. The light is focused by a convex lens on a screen placed on the focal plane. The first minimum will be formed for the angle of diffraction equal to,

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Gamma Question Bank for Medical Physics>Chapter 27 - Wave Optics>Assigment>Q 26

The phenomenon of diffraction can be exhibited by

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Gamma Question Bank for Medical Physics>Chapter 27 - Wave Optics>Assigment>Q 27

Though quantum theory of light can explain a number of phenomenon observed with light, it is necessary to retain the wave nature of light to explain the phenomenon of