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12th West Bengal Board
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In Young's double slit experiment, first slit has width four times the width of the second slit. The ratio of the maximum intensity to the minimum intensity in the interference fringe system is

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Important Questions on Wave Optics

HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 17 - Wave Optics>EXERCISE 17>Q 35
In Young's double slit experiment intensity at a point is 14 of the maximum intensity. Angular position of this point is
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 17 - Wave Optics>EXERCISE 17>Q 36
In Young's double slit experiment, the slit width and the distance of slits from the screen both doubled. The fringe width 
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 17 - Wave Optics>EXERCISE 17>Q 37

A Young's double slit experiment uses a monochromatic source. The shape of the interference fringes formed on a screen is

HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 17 - Wave Optics>EXERCISE 17>Q 38
Two light rays having the same wavelength λ in vacuum are in phase initially. Then the first ray travels a path L1 through a medium of refractive index n1 while the second ray travels a path of length L2 through a medium of refractive index n2. The two waves are then combined to produce interference. The phase-difference between the two waves is
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 17 - Wave Optics>EXERCISE 17>Q 39
Monochromatic light of wavelengths 400 nm and 560 nm are incident simultaneously and normally on a double slit apparatus where slit separation is 0.1 mm and screen distance is 1 m. The minimum distance between two successive regions of complete darkness is
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 17 - Wave Optics>EXERCISE 17>Q 40
Two beams of light having intensities I and 4I interfere to produce a fringe pattern on a screen. The phase-difference between the beams is π2 at point A and π at point B. Then the difference between the resultant intensities at A and B is 
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 17 - Wave Optics>EXERCISE 17>Q 41

In Young's double slit experiment 12 fringes are observed to be formed in a certain segment of the screen when the light of wavelength 600 nm is used. If the wavelength of the light is changed to 400 nm, number of fringes observed in the same segment of the screen is given by

MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 17 - Wave Optics>EXERCISE 17>Q 42
In an ideal double-slit experiment, when a glass-plate (refractive index 1.5) of thickness t is introduced in the path of one of the interfering beams (wavelength λ ), the intensity at the position where the central maximum occurred previously remains unchanged. The minimum thickness of the glass plate is