Displacement of Fringes Interference Quiz

1. Let O be a center point on the screen, also distance between two slits S₁ and S₂ is very small. When we introduce the mica sheet in the path S₁O, do you thinks that light will reach at different times at point O, compare to the path S₂O.

2. What is the relationship between refractive index “μ”, speed of light in vaccum “c”, and speed of light in any transparent medium “v”;

3. What is the correct relation for time difference, between the two light waves which reachs at a certain point. When we put a mica sheet of thickness “t’ and refractive index “μ”, and speed of light is “c”.

4. The time taken by light from S₁ to P is

5. We know by putting a sheet in the optical path fringes shift with a new center on screen. If we have to find effective path difference at any point (say P). The required formula will be;

6.

When we put a mica sheet of thickness “t” in the light path it takes extra time to reach at a certain point. We know that in absence of the mica sheet, the two waves which were reaching at certain point at same time, will be different now. If that certain point shifted in that way so the light wave which is free from mica sheet reach at same time as the light with mica sheet. Then your conclusion will be;

7. What do you think by putting a mica sheet in the path of light from S₁ to P?

8. The optical path travelled by the light from S1 to the P, if water is filled between source and screen, will be?

9. Does time taken by the light to complete the path from S₁ to P will be longer compared to the S₂P. If your answer is yes, then reason of it according to you;

10. Does fringe shift depends on the time taken by the two light waves to reach at a certain point?