Quiz displacement of Fringes

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

S₁P μ

S₁P

$\frac{S_{1}P}{\mu}$

S₁P-μ

2. 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”.

$\frac{(\mu + 1)}{c}$

$\frac{(\mu -1)t}{c}$

$\frac{c}{\mu + t}$

$\frac{c}{\mu t}$

3. 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;

Light speed changes one medium to the other, it travel faster in air and slower in mica transparent plate.

Light speed changes from rare to the denser medium, but average time to cover the overall distance (in above case for S₁P) will remain same as traveled from S₂P

For a small thickness (order of micrometer) light speed remain same

Sometimes wavelength also matter, if we use red color light it will take longer time as compared to the blue color light.

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

$\frac{S_{1}P - t}{c}$

$\frac{S_{1}P+(\mu -1)t}{c}$

$\frac{S_{2}P - (\mu +1)}{c}$

$\frac{S_{1}P- \mu}{c}+\frac{c}{v}$

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;

$= S_{2}P-[S_{1}P-(\mu -1)t]$

$=S_{2}P-S_{1}P$

$[S_{1}P-(\mu -1)t]-S_{2}P$

$S_{2}P-S_{1}P-\mu t-1$

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

c = μ/v

μ = c/2v

μ = c/v

μ = v/c

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

Yes

8. 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.

True

False

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;

The optical path (distance) for light from the source S2 has been increased

The optical path (distance) for light from the sources S1 and S2 becomes equal

The optical path (distance) for light from the source S1 has been decreased

There is no possibility to shift the fringes in the presence of mica sheet

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

Light will travel more distance

Light will travel same distance

Distance will reduce for the light

Distance and time both will decrease

Question 1 of 10

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