Optics Test 03 (Class 12, CBSE) Class 12 Notes | EduRev

Class 12 : Optics Test 03 (Class 12, CBSE) Class 12 Notes | EduRev

 Page 1


CBSE TEST PAPER-03 
CLASS - XII PHYSICS  
Topic:-Wave Optics  
Marks: 20 
1. State the conditions that must be satisfied for two light sources to be coherent? [1] 
2. In young’s double slit experiment. The distance between the slits is halved,
what change in the fringe width will take place? [1] 
3. Consider interference between two sources of intensities I and 4I.
What will be the intensity at points where phase differences is ( ) ( ) 1 2
2
p
p [2] 
4. Can white light produce interference? What is the nature? [2] 
5. In young’s double slit experiment while using a source of light of wavelength
5000A
o
, the fringe width obtained is 0.6cm. If the distance between the slit
and the screen is reduced to half, calculate the new fringe width? [3] 
6. What is polarization of light? What type of waves show the property of polarization?
Name any two methods to produce plane polarized light? [3] 
7. Draw the curve depicting, variation of intensity in the interference pattern
in young’s double slit experiment. State conditions for obtaining sustained
interference of light? [3] 
8. (a)     Derive all expression for the fringe width in young’s double slit experiment? [3] 
(b)     If the two slits in young’s double slit experiment have width ratio 4:1,
deduce the ratio of intensity of maxima and minima in the interference pattern?  [2] 
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