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12th ICSE
IMPORTANT
Earn 100

Compare interference and diffraction. Obtain the expression for half and full angular width of central maxima in diffraction pattern.

Important Questions on Diffraction of Light

MEDIUM
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>QUESTIONS>Q 1
Fraunhofer diffraction from a single-slit of width 1.0 μm is observed with light of wavelength 500 nm. Calculate the half angular width of the central maximum.
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.
MEDIUM
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 subsidiary maxima on the two sides of the central maximum.
MEDIUM
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>QUESTIONS>Q 4
A parallel beam of light of wavelength 6×10-5 cm falls normally on a straight slit of width 0.2 mm. Find the total angular width of the central diffraction maximum and also its linear width as observed on a screen placed 2 metre away.
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.
MEDIUM
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>QUESTIONS>Q 6
A narrow slit of width 0.3 mm is illuminated normally by a parallel beam of light of wavelength 6×10-7 m. The Fraunhofer diffraction pattern is obtained on a screen placed in the focal plane of a convex lens of focal length 25 cm. The lens is placed quite close to the slit. Find the width of central maximum on the screen.
HARD
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 8 - Diffraction of Light>QUESTIONS>Q 7
A parallel light beam of wavelength 6000 Å passes through a slit 0.2 mm wide and forms a diffraction pattern on a screen 1.0 m away from the slit. Find the width of the central maximum on the screen. What would be the width of this maximum, if the apparatus be immersed in water of refractive index 43?