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About Newtion ring experiment

  • Thread starter kenok1216
  • Start date
  • #1
58
1

Homework Statement


擷取3.PNG

refractive index of prism=1.45
λ=450nm
50 bright ring are observed
find d


Homework Equations


2d=nλ/2

The Attempt at a Solution


since 50 bright rings are observed n=24 (-24---------0-------------24)
if the distance travel=λ/2 constructive interference will happen
since the ray1 reflected by prism(n=1.45--->n=1 air)no phase shift
by ray 2 air to flat plate have phase shift

2d=24(λ/2) and λ=450nm/n=450nm/1.45=310nm
d=[310nm(24)]/4=1.86x10^-6m but the answer=1.11x10^5m why?????
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Last edited:

Answers and Replies

  • #2
963
213

Homework Equations


2d=nλ/2
i think
for constructive interference -draw a diagram of the rays interfering at thickness d
the correct condition perhaps is
path difference = n. wavelength (in phase)
and path difference =2.d + (wavelength / 2)
check from your text book
 
  • #3
58
1
i think
for constructive interference -draw a diagram of the rays interfering at thickness d
the correct condition perhaps is
path difference = n. wavelength (in phase)
and path difference =2.d + (wavelength / 2)
check from your text book
so do you mean nλ=2d+
i think
for constructive interference -draw a diagram of the rays interfering at thickness d
the correct condition perhaps is
path difference = n. wavelength (in phase)
and path difference =2.d + (wavelength / 2)
check from your text book
why pd=2d+λ/2?
 
  • #4
963
213
so do you mean nλ=2d+

why pd=2d+λ/2?
draw the ray diagram for interference
 

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