HARD
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Draw and compare the intensity graph of single slit diffraction and double slit interference.

Important Questions on Wave Optics

MEDIUM
Physics>Optics>Wave Optics>Diffraction of Light
A single slit of width 0.1 mm is illuminated by a parallel beam of light of wavelength 6000 Å and diffraction bands are observed on a screen 0.5 m from the slit. The distance of the third dark band from the central bright band is:
MEDIUM
Physics>Optics>Wave Optics>Diffraction of Light
A linear aperture whose width is 0.02 cm is placed immediately in front of a lens of focal length 60 cm. The aperture is illuminated normally by a parallel beam of wavelength 5×10-5 cm. The distance of the first dark band of the diffraction pattern from the centre of the screen is
MEDIUM
Physics>Optics>Wave Optics>Diffraction of Light
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 cm 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)
HARD
Physics>Optics>Wave Optics>Diffraction of Light
Visible light of wavelength 6000×10-8cm falls normally on a single slit and produces a diffraction pattern. It is found that the second diffraction minimum is at 60o from the central maximum. If the first minimum is produced at θ1, then θ1 is close to
EASY
Physics>Optics>Wave Optics>Diffraction of Light
For what distance is ray optics a good approximation when the aperture is 4 mm wide and the wavelength is 500 nm ?
EASY
Physics>Optics>Wave Optics>Diffraction of Light
A beam of light of λ=600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between first dark fringes on either side of the central bright fringe is:
EASY
Physics>Optics>Wave Optics>Diffraction of Light
A parallel beam of light of wavelength 4000 A∘ passes through a slit of width 5×10-3 m. The angular spread of the central maxima in the diffraction pattern is
MEDIUM
Physics>Optics>Wave Optics>Diffraction of Light
Which of the statements are correct with reference to single slit diffraction pattern?
(i) Fringes are of unequal width
(ii) Fringes are of equal width
(iii) Light energy is conserved
(iv) Intensities of all bright fringes are equal
MEDIUM
Physics>Optics>Wave Optics>Diffraction of Light
 Describe any two characteristic features which distinguish between interference and diffraction phenomena. Derive the expression for the intensity at a point of the interference pattern in Young’s double slit experiment.
MEDIUM
Physics>Optics>Wave Optics>Diffraction of Light
What do you understand by diffraction? Write the difference between diffraction and interference.
HARD
Physics>Optics>Wave Optics>Diffraction of Light
A screen is placed 2 m away from a narrow slit. If the first minimum lies 5 mm from either side of the central maxima, when plane waves of wave length 5×10-7 m are used, the slit width is:
EASY
Physics>Optics>Wave Optics>Diffraction of Light
Write any two differences between and interference of light.
EASY
Physics>Optics>Wave Optics>Diffraction of Light
Consider the diffraction pattern obtained from the sunlight incident on a pinhole of diameter 0.1 μm. If the diameter of the pinhole is slightly increased, it will affect the diffraction pattern such that
MEDIUM
Physics>Optics>Wave Optics>Diffraction of Light
The angular width of the central maximum in a single slit diffraction pattern is 60° . The width of the slit is 1 μm. The slit is illuminated by monochromatic plane waves. If another slit of the same width is made near it, Young's fringes can be observed on a screen placed at a distance 50 cm from the slits. If the observed fringe width is 1 cm, what is slit separation distance? (i.e., the distance between the centres of each slit.)
MEDIUM
Physics>Optics>Wave Optics>Diffraction of Light
In a single slit diffraction (of width α) by a monochromatic source of wavelength λ the first minimum of the intensity distribution occurs at an angle
EASY
Physics>Optics>Wave Optics>Diffraction of Light
A screen is placed 50 cm from a single slit which is illuminated with light of wavelength 600 nm. If the distance between the first and third minima is the diffraction pattem is 3 mm. the width of the slit is.
EASY
Physics>Optics>Wave Optics>Diffraction of Light
A screen is placed 50 cm from a single slit, which is illuminated with a light of wavelength 600 nm. If the distance between the first and third maxima in the diffraction pattern is 3 mm. then calculate its slit width.
MEDIUM
Physics>Optics>Wave Optics>Diffraction of Light
Light of wavelength 550 nm falls normally on a slit of width 22.0×10-5 cm. The angular position of the second minima from the central maximum will be (in radians):
MEDIUM
Physics>Optics>Wave Optics>Diffraction of Light
Write four differences between interference and diffraction.
EASY
Physics>Optics>Wave Optics>Diffraction of Light
For what distance the ray optics will be a good approximation when the aperture is 5 mm wide and the wavelength is 450 nm?