MEDIUM
12th ICSE
IMPORTANT
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Draw diagram of diffraction of light due to a single slit and draw a graph showing the variation of intensity of light in a single slit Fraunhofer diffraction.

Important Questions on Diffraction of Light

MEDIUM
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>QUESTIONS>Q 2
Fraunhofer diffraction from a single-slit of width 1.24×10-6 m is observed with light of wavelength 6200 Å. Calculate the angular width of the central maximum.
HARD
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>QUESTIONS>Q 3
A parallel beam of light of wavelength 600 nm falls normally on a narrow slit of width 0.3 mm. Calculate the angular separation between the first minimum and the central maximum.
HARD
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>QUESTIONS>Q 5
A Fraunhofer diffraction pattern due to a single-slit of width 0.2 mm is being obtained on a screen placed at a distance of 2 metre from the slit. The first minima lie at 5 mm on either side of the central maximum on the screen. Find the wavelength of light.
EASY
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 1
At the first minimum adjacent to the central maximum of a single-slit diffraction pattern, the phase difference between the Huygens' wavelet from the edge of the slit and the wavelet from the mid-point of the slit is:
MEDIUM
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 3
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:
MEDIUM
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 4
For a parallel beam of monochromatic light of wavelength λ, diffraction is produced by a single slit whose width e is of the wavelength of light. If D is the distance of the screen from the slit, the width of the central maxima will be:
MEDIUM
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 6
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 light 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
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 7
In a diffraction pattern due to a single slit of width e, the first minimum is observed at an angle 30° when light of wavelength 5000 Ao is incident on the slit. The first secondary is observed at an angle of: