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Wave Optics Tes...

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  • Question 1
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    Light is incident at an angle $$\phi$$ with the normal to a plane containing two slits of separation $$d$$. Select the expression that correctly describes the positions of the interference maxima in terms of the incoming angle $$\phi$$ and outgoing angle $$\theta$$

  • Question 2
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    A thin film of refractive index $$1.5$$ and thickness $$4\times { 10 }^{ -5 }cm$$ illuminated by light normal to the surface. What wavelength within the visible spectrum will be intensified in the reflected beam?

  • Question 3
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    Directions For Questions

    Interference of light refers to the modification in the intensity distribution of light in a region due to super-position of light waves. Points where the waves arrive in phase are points of maximum intensity (called maxima), whereas minima is obtained when two waves arrive at a point out of the phase. For a production of the interference pattern on a screen, it is essential that the sources producing interference be coherent sources.

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    The interference of light was first demonstrated experimentally by 

  • Question 4
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    A plane wave of monochromatic light falls normally on a uniform thin film of oil which covers a glass plate. The wavelength of source can be varied continuously. Complete destructive interference is observed for $$\lambda=5000\mathring { A } $$ and $$\lambda=1000\mathring { A } $$ and for no other wavelength in between. If $$\mu$$ of oil is $$1.3$$ and that of glass is $$1.5$$, the thickness of the film will be

  • Question 5
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    In a double-slit experiment, instead of taking slits of equal width, one slit is made twice as wide as the other. Then in the interference pattern

  • Question 6
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    A person wishes to distinguish between two pillars located at a distance of 11 km. What should be the minimum distance between these pillars (resolving power of normal human eye is 1')?

  • Question 7
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    Consider an YDSE that has different slits width, as a result, amplitudes of waves from two slits are $$A$$ and $$2A$$, respectively. If $$I_{0}$$ be the maximum intensity of the interference pattern, then intensity of the pattern at a point where phase difference between waves is $$\phi$$ is :

  • Question 8
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    If one of the two slits of Young's double-slit experiment is painted so that it transmits half the light intensity as the second slit, then

  • Question 9
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    Light waves travel in vacuum along the y-axis. Which of the following may represent the wavefront?

  • Question 10
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    A monochromatic beam of light falls on Young's double slit experiment apparatus as shown in figure. A thin sheet of glass is inserted .in front of lower slit $$S_{2}$$.
    The central bright fringe can be obtained :

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