Wave Optics Test 02 Class 12 Notes | EduRev

Class 12 : Wave Optics Test 02 Class 12 Notes | EduRev

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CBSE TEST PAPER-02 
CLASS - XII PHYSICS  
Topic:-Wave Optics  
Marks: 20 
1. Draw a diagram to show cylindrical wavefront? [1] 
2. A light wave enters from air to glass. How will the following be affected: [1] 
(i) Energy of the wave
(ii) Frequency of the wave:
3. Obtain an expression for the ratio of intensities at maxima and minima in an
interference pattern. [2] 
4. A slit S is illuminated by a monochromatic source of light to give two coherent
sources P 1 and P 2. These given bright and dark bands on a screen. At a point
R, on the screen, there is a dark fringe. What relation must exist between the
lengths P 1R and P2R? [2] 
5. State Brewster law? Using this law prove that, at the polarizing angle of
incidence, the reflected and transmitted rays are perpendicular to each other? [3] 
6. In a single slit experiment, how is the angular width of central bright fringe
maximum changed when [3] 
1) The slit width increased
2) The distance between the slit and the screen is increased.
3) Light of smaller wavelength is used.
7. In a young’s double slit experiment, the slit are repeated by 0.24mm. The screen
is 1.2m away from the slits. The fringe width is 0.3cm calculate the wavelength of
light used in the experiment? [3] 
8. (a)      State Huygens’s principle for constructing wavefronts? [2] 
(b)     Using Huygens’s principle deduce the laws of reflection of light? [3] 
(c)  What changes in diffraction pattern of a single slit will you observe 
when the monochromatic source of light is replaced by a source of white light?  [2] 
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