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               PHYSICS , CLASS -12, CHAPTER -10( WAVE OPTICS)

                   1.  How does the fringe width of interference fringes change, when the whole apparatus of
                       Young’s experiment is kept in a liquid of refractive index 1.3? (Delhi 2008)
                   2.  At what angle of incidence should a light beam strike a glass slab of refractive index
                       [latex]\sqrt{3}[/latex], such that the reflected and the refracted rays are perpendicular to
                       each other? (Delhi 2008)
                   3.   In a single slit diffraction experiment, the width of the slit is reduced to half its original
                       width. How would this affect the size and intensity of the central maximum? (Comptt.
                       Delhi 2012)
                   4.  Draw the shape of the wavefront coming out of a concave mirror when a plane wave is
                       incident on it. (Comptt. All India 2013)
                   5.  Define the term ‘linearly polarised light’. When does the intensity of transmitted light
                       become maximum, when a polaroid sheet is rotated between two crossed polaroids? (All
                       India 2008)
                   6.  Write the distinguishing features between a diffraction pattern due to a single slit and the
                       interference fringes produced in Young’s double slit experiment?
                   7.  Find an expression for intensity of transmitted light when a polaroid sheet is rotated
                       between two crossed polaroids. In which position of the Polaroid sheet will the
                       transmitted intensity be maximum? (Delhi 2015)
                   8.  State Brewster’s law. The value of Brewster angle for a transparent medium is different
                       for light of different colours. Give reason. (Delhi 2016)
                   9.  Draw the intensity pattern for single slit diffraction and double slit interference. Hence,
                       state two differences between interference and diffraction patterns. (All India 2017)
                   10. How is a wavefront defined? Using Huygen’s construction draw a figure showing the
                       propagation of a plane wave refracting at a plane surface separating two media. Hence
                       verify Snell’s law of refraction. (Delhi 2008)
                   11. Distinguish between unpolarised and plane polarised light. An unpolarised light is
                       incident on the boundry between two transparent media. State the condition when the
                       reflected wave is totally plane polarised. Find out the expression for the angle of
                       incidence in this case. (All India 2008)
                   12. Describe Young’s double slit experiment to produce interference pattern due to a
                       monochromatic source of light. Deduce the expression for the fringe width. (Delhi 2011)
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