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Renu Yadav

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Physics

University

Wedge shaped films & Newton's Rings Experiment

Renu Yadav

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15 questions

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1. Multiple Choice
30 seconds
1 pt
"Fringes of equal thickness" also called as :
Haidinger's Fringes
Fizeau Fringes
FECO Fringes
Ray Fringes
2. Multiple Choice
30 seconds
1 pt
A wedge shaped film has
Non uniform thickness
Zero thickness at one end and it increasing towards other end
Zero thickness at both ends
Thickness increases and decreases alternately
3. Multiple Choice
30 seconds
1 pt
If plane mirror is used in place of glass plate in Newton's Ring experiment -
Multicolour fringes are seen
Only bright fringes are seen
No fringes are seen
Only dark fringes are seen
4. Multiple Choice
30 seconds
1 pt
When Newton's rings interference pattern is viewed from above by means of reflected light , the central spot is -
Dark
Bright
Multicoloured
None of these
5. Multiple Choice
30 seconds
1 pt
In Newton's ring experiments , the diameter of dark rings is proportional to
Odd natural number
Square roots of odd natural numbers
Even natural number
Square root of natural number
6. Multiple Choice
30 seconds
1 pt
In Newton's ring experiment , the diameter of bright ring is proportional to
Odd natural numbers
Natural numbers
Square roots of odd natural numbers
Square roots of natural numbers
7. Fill in the Blank
45 seconds
1 pt
In Newton's Ring experiment , rings gradually becomes __________as their radii increases.
8. Multiple Choice
30 seconds
1 pt
Newton's Rings are produced by
Polarization of light
Interference of light
Reflection
Refraction
9. Multiple Choice
30 seconds
1 pt
Which phenomenon is observed in the following figure -
Wedge shaped film interference
Parallel film interference
Refraction
Newton's rings
10. Multiple Choice
45 seconds
1 pt
Path difference in case of interference by wedge shaped film depends upon
Varying thickness of the film
Source of light
Varying angle of incidence provided broad source
Interference
11. Fill in the Blank
1 minute
1 pt
Fringe width $\beta$ is _______________ with the decrease of the angle of wedge in wedge shaped films.
12. Fill in the Blank
1 minute
1 pt
The phenomenon of interference in wedge shaped film is applied in testing the _______________of a surface.
13. Open Ended
3 minutes
1 pt
Write applications of interference phenomenon.
14. Multiple Choice
30 seconds
1 pt
When the light falls normally on a small - angled wedge film then the fringe width $\beta$ is given by -
$\beta=\frac{\lambda}{2\mu\cos\alpha}$
$\beta=\frac{\lambda}{\mu\alpha}$
$\beta=\frac{\lambda}{2\ \tan\alpha\sqrt{\mu^2-\sin^2i}}$
$\beta=\frac{\lambda}{2\mu\alpha}$
15. Multiple Choice
30 seconds
1 pt
What is the necessary condition to observe Newton's rings with a bright centre in reflected light.
$\mu_1=\mu>\mu_2$
$\mu_1>\mu>\mu_2$
$\mu_1<\mu>\mu_2$
$\mu_1<\mu<\mu_2$
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