What is the Newtion Ring Experiment?

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The discussion focuses on the Newton Ring Experiment, specifically calculating the distance between rings using the refractive index of a prism and the wavelength of light. The participant attempts to solve for the distance 'd' using the equation 2d = nλ/2, noting that 50 bright rings indicate n=24. They calculate the wavelength in the medium and derive a distance of 1.86x10^-6m, but question the discrepancy with the expected answer of 1.11x10^5m. The conversation emphasizes the importance of understanding constructive interference conditions and suggests consulting textbooks for clarification on path differences. The need for a ray diagram is also highlighted to visualize the interference process.
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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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kenok1216 said:

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 textbook
 
drvrm said:
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 textbook
so do you mean nλ=2d+
drvrm said:
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 textbook
why pd=2d+λ/2?
 
kenok1216 said:
so do you mean nλ=2d+

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