- #1
kenok1216
- 58
- 1
Homework Statement
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? [/B]
Last edited: