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## Homework Statement

Light of wavelength [tex]\lambda[/tex] strikes a pane of glass of thickness T and refractice index n, as shown in figure(I attached a diagram I made). Part of the beam is reflected off the upper surface of the glass, and part is transmitted and then reflected off the lower surface of the glass.

*interference between these two beams will occur if :*

**Destructive**a) T = [tex]\lambda[/tex] / 2

b) 2T = [tex]\lambda[/tex] / 2

c) T = [tex]\lambda[/tex] / 2n

d) 2T = [tex]\lambda[/tex] / 2n

## Homework Equations

2T= m[tex]\lambda[/tex]

## The Attempt at a Solution

According to this equation, destructive interference occurs when 2T = [tex]\lambda[/tex] /2. Right? Since [tex]\lambda[/tex] = [tex]\lambda[/tex] [tex]_{0}[/tex] / n, then 2T= [tex]\lambda[/tex] / 2n right? The correct answer is C though. I got answer D. What am i doing wrong. Thanks