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IMPORTANT
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A parallel beam of light of all wavelength greater than 3000 A0 falls on a double slit in a Young's double-slit experiment. It is observed that the wavelengths 3600 A0 and 6000 A0 are absent at a distance of 31.5 mm from the position of the central maximum, and the orders of the interference at this point for the two wavelengths differ by 7 . If the distance between the slits and the screen is 1 m, the separation between the two slits (in mm ) is :

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Important Questions on Wave Optics

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JEE Main
IMPORTANT
Physics Crash Course JEE Main>Chapter 19 - Wave Optics>Level 3>Q 4
A thin oil film of refractive index 1.2 floats on the surface of water (μ=43). When a light of wavelength λ=9.6×10-7m falls normally on the film from air, then it appears dark when seen normally. The minimum change in its thickness for which it will appear bright in normally reflected light by the same light is:
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JEE Main
IMPORTANT
Physics Crash Course JEE Main>Chapter 19 - Wave Optics>Level 3>Q 5
The path difference between two interfering waves at a point on the screen is λ6. The ratio of intensity at this point and that at the central bright fringe will be (Assume that intensity due to each slit in same)
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JEE Main
IMPORTANT
Physics Crash Course JEE Main>Chapter 19 - Wave Optics>Level 3>Q 6
Two coherent point sources S1 and S2 vibrating in phase emit light of wavelength λ . The separation between the sources is 2λ . The smallest distance from S2 on a line passing through S2 and perpendicular to S1S2 where a minimum intensity occurs is
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JEE Main
IMPORTANT
Physics Crash Course JEE Main>Chapter 19 - Wave Optics>Level 3>Q 7
When interference of light takes place
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JEE Main
IMPORTANT
Physics Crash Course JEE Main>Chapter 19 - Wave Optics>Level 3>Q 8

In Young's experiment for the interference of light, the separation between the slits is d and the distance of the screen from the slits is D. If D is increased by 0.5% and d is decreased by 0.3% then for the light of a given wavelength, which one of the following is true?

"The fringe width......

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JEE Main
IMPORTANT
Physics Crash Course JEE Main>Chapter 19 - Wave Optics>Level 3>Q 9
Orange light of wavelength 6000×10-10 m illuminates a single slit of width 0.6×10-4 m. The maximum possible number of diffraction minima produced on both sides of the central maximum is ___________ .
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JEE Main
IMPORTANT
Physics Crash Course JEE Main>Chapter 19 - Wave Optics>Level 3>Q 10
If the wavelength of light used is 6000 Å. The angular resolution of the telescope of an objective lens having diameter 10 cm is _____ rad.
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JEE Main
IMPORTANT
Physics Crash Course JEE Main>Chapter 19 - Wave Optics>Level 3>Q 11
Two beams, A and B, of plane polarized light with mutually perpendicular planes of polarization are seen through a polaroid. From the position when the beam A has maximum intensity (and beam B has zero intensity), a rotation of polaroid through 30° makes the two beams appear equally bright. If the initial intensities of the two beams are IA and IB respectively, then IAIB equals: