Interferene

Question 1

What is interference of light

Answer 1

It’s a phenomenon of redistribution of light energy in space when 2 waves from coherent sources superimpose on each other

Question 2

Resultant amplitude

Answer 2

Ar = ( a^2 + a’^2 + 2aa’cos@)^1/2

Question 3

Resultant amplitude

Answer 3

Ir = I + I’ + 2(II’)^1/2cos@

Question 4

Phase difference for constructive interference

Answer 4

2||n or 0

Question 5

Resultant amplitude for constructive interference

Answer 5

(a + a’)^1/2

Question 6

Maximum amplitude

Answer 6

I + I’ + 2(II’)^1/2cos@

Question 7

Phase difference for destructive interference

Answer 7

(2n-1)||

Question 8

Resultant amplitude for destructive interference

Answer 8

a^2 + a’^2 -2aa’cos@

Question 9

Resultant intensity for destructive interference

Answer 9

I + I’ - 2(II’)^1/2cos@

Question 10

Amplitude ratio (r) =

Answer 10

a1/a2

Question 11

Imax/Imin =?

Answer 11

[(r+1)/(r-1)]^1/2

Question 12

What does YDSE demonstrate

Answer 12

It demonstrates the probabilistic nature of quantum mechanical phenomenon

Question 13

Fringe width (interference)

Answer 13

Beta= wavelength x D/d

Question 14

Dark Fringe =

Answer 14

(n-1/2) x wavelength x D/d

Question 15

Bright fringe =

Answer 15

n x wavelength x D/d

Question 16

Angular separation (interference) =

Answer 16

Theta = wavelength/d

Question 17

Angular separation for bright fringe =

Answer 17

(n + 1/2) x wavelength/d

Question 18

Angular separation for dark fringe =

Answer 18

n x wavelength/d

Question 19

Fringe shift =

Answer 19

(n-1)t

Where n is refractive index

Question 20

Fringe shift if 2 slabs are involved

Answer 20

(n - n’)t

Net shift is towards the slab with greater refractive index