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## 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

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]

d=[310nm(24)]/4=1.86x10^-6m but the answer=1.11x10^5m why?????

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