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12th West Bengal Board
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In a Young's experiment, two coherent sources are placed 0.9 mm apart and the fringes are observed 1 m away. If it produces the second dark fringe at a distance of 1 mm from the central fringe, the wavelength of monochromatic light used would be

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Important Questions on Wave Optics

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12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 17 - Wave Optics>EXERCISE 17>Q 23
In a Young's double slit experiment the intensity at a point where the path-difference is λ6(λ being the wavelength of the light used) is I. If I0 denotes the maximum intensity, II0 is equal to 
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 17 - Wave Optics>EXERCISE 17>Q 24

The maximum number of interference maxima for slit separation equal to two times the wavelength in YDSE, is.

MEDIUM
12th West Bengal Board
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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 17 - Wave Optics>EXERCISE 17>Q 25
Light from two coherent sources of the same amplitude A and wavelength λ illuminates the screen. The intensity of the central maximum is I0. If the sources were incoherent, the intensity at the same point will be 
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12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 17 - Wave Optics>EXERCISE 17>Q 26
In a Young's double slit experiment with sodium vapour lamp of wavelength 589 nm and the slit 0.589 mm apart, the half angular width of the central maximum is
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 17 - Wave Optics>EXERCISE 17>Q 27
In the Young's double slit experiment, the central maxima is observed to be I0. If one of the two slits is covered, then the intensity at the central maxima will become
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12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 17 - Wave Optics>EXERCISE 17>Q 28
Two beams of light of intensity I1 and I2 interfere to give an interference pattern. If the ratio of maximum intensity to that of minimum intensity is 259, then I1I2 is
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 17 - Wave Optics>EXERCISE 17>Q 29
If the fringe width with λ=5.89×10-5 cm is 0.431 mm and shift of white central fringe on introducing a mica sheet in one path is 1.89 mm. Thickness of the mica sheet will be (μ=1.59)
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 17 - Wave Optics>EXERCISE 17>Q 30

To demonstrate interference we require two sources which emit radiations of