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

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

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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 youngâ€™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 youngâ€™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 youngâ€™s double slit experiment. State conditions for obtaining sustained
interference of light? [3]
8. (a)     Derive all expression for the fringe width in youngâ€™s double slit experiment? [3]
(b)     If the two slits in youngâ€™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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