EASY
12th West Bengal Board
IMPORTANT
Earn 100

In a Young's double slit experiment, the angular width of a fringe formed on a distant screen is 0.12°. If the wavelength of light used is 4800 A˙, find the distance between the slits.

Important Questions on Wave Optics

EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 17 - Wave Optics>EXERCISE 17>Q 16
In a Young's experiment the two coherent sources have intensities I and 4I. Find the intensity at a point on the screen where the phase-difference between the two waves is π3.
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 17 - Wave Optics>EXERCISE 17>Q 17
Monochromatic light of wavelength 500 nm is used in a Young's apparatus. The separation between the two slits is 5×10-4 m and the screen is at a distance 1.0 m from the slits. Now one of the slit is covered by a glass sheet of thickness 1.5×10-6 m and refractive index 1.5. Find the lateral shift of the central maximum. 
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 17 - Wave Optics>EXERCISE 17>Q 18
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.
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 17 - Wave Optics>EXERCISE 17>Q 19
Light of wavelength 600 nm falls normally on a slit of width 1.2 μ m  producing Fraunhoffer diffraction pattern on a screen. Calculate the angular position of first minimum and the angular width of the central maximum.
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 17 - Wave Optics>EXERCISE 17>Q 20
Light of wavelength 500 nm falls from a distant source, on a slit 0.50 mm wide. Find the distance between the two dark bands on either side of the central bright band of the diffraction pattern observed on a screen placed 2 m from the slit
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 17 - Wave Optics>EXERCISE 17>Q 21
At what angle of incidence should a light beam strike a glass slab of refractive index 3, such that reflected and refracted rays are perpendicular to each other.
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 17 - Wave Optics>EXERCISE 17>Q 22
Calculate the distance a beam of light of wavelength 500 nm can travel without significant broadening if the diffraction aperture is 3 mm wide. 
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 17 - Wave Optics>EXERCISE 17>Q 23
Two slits are made 1 mm apart and the screen is placed one metre away. What is the fringe separation when blue-green light of wavelength 500 nm is used. What should the width of each slit be to obtain 10 maxima of the double slit pattern within the central maximum of the single slit pattern.