EASY
12th West Bengal Board
IMPORTANT
Earn 100

Two coherent sources have intensities in the ratio 25: 16. Find the ratio of the intensities of maxima and minima, after interference of light occurs. 

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 13
In a Young's double slit experiment first performed in air and then in a liquid, it found that 8th bright fringe in air is replaced by 10 th bright fringe in liquid. Find the refractive index of the liquid 
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 17 - Wave Optics>EXERCISE 17>Q 14
In a Young's double slit experiment, if the slit widths are in the ratio of 1:2, find the ratio of the intensities at minima and maxima. 
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 17 - Wave Optics>EXERCISE 17>Q 15
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.
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