Light interference

  • #1
156
15

Homework Statement


3229489409_600485485_574_574.jpg
[/B]
Find condition of d that constructive interference occurs
with m=1,2,3,...
a)##(m-\frac{1}{2})\frac{\lambda}{2}##
b)##m\frac{\lambda}{2}##
c)##(m-\frac{1}{2})\lambda##
d)##m\lambda##

Homework Equations


optical path difference (OPD) must equal ##m\lambda##

The Attempt at a Solution


The optical path difference i finded is:
$$2d+\frac{\lambda}{2}=m\lambda$$
So ##d=(m-\frac{1}{2})\frac{\lambda}{2}## and I choose A
But the answer is B)## d=m\lambda##
Where is wrong?
Thanks for helping
 

Answers and Replies

  • #2
TSny
Homework Helper
Gold Member
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3,496
Your work looks correct to me. I also think (a) is the right answer.
 
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