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In a Young double-slit experiment, the central bright fringe can be identified:

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Important Questions on Wave Optics

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Comprehensive Guide to AP EAPCET Physics>Chapter 12 - Wave Optics>Exercise 1>Q 14
In Young's double-slit arrangement, water is filled in the space between screen and slits. Then:
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Comprehensive Guide to AP EAPCET Physics>Chapter 12 - Wave Optics>Exercise 1>Q 15
In Young double-slit experiment, the two slits act as coherent sources of equal amplitude A and wavelength λ. In another experiment with the same set up the two slits are sources of equal amplitude A and wavelength λ but are incoherent. The ratio of the intensity of light at the midpoint of the screen in the first case to that in the second case is :
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Comprehensive Guide to AP EAPCET Physics>Chapter 12 - Wave Optics>Exercise 1>Q 16
In a double-slit experiment, instead of taking slits of equal widths, one slit is made twice as wide as the other. Then in the interference pattern:
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Comprehensive Guide to AP EAPCET Physics>Chapter 12 - Wave Optics>Exercise 1>Q 17
In Young's double-slit experiment, the wavelength of red light is 7800 Å and that of blue light is 5200 Å. The value of n for which nth bright band due to red light coincides with (n+1)th the  bright band due to blue light is:
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Comprehensive Guide to AP EAPCET Physics>Chapter 12 - Wave Optics>Exercise 1>Q 18
In Young's double-slit experiment, let A and B be the two slits. A thin film of thickness t and refractive index μ is placed in front of A. Let β= Fringe width. The central maximum will shift:
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Comprehensive Guide to AP EAPCET Physics>Chapter 12 - Wave Optics>Exercise 1>Q 19
When light passing through rotating nicol is observed, no change in intensity is seen. What inference can be drawn?
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Comprehensive Guide to AP EAPCET Physics>Chapter 12 - Wave Optics>Exercise 1>Q 20
When violet light incident on a narrow aperture is replaced by a blue one, then the diffraction pattern will-
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Comprehensive Guide to AP EAPCET Physics>Chapter 12 - Wave Optics>Exercise 1>Q 21
In Fraunhofer diffraction the centre diffraction image is