Light Interference Webassign question

[nickredsox]

Homework Statement

Light of wavelength 525 nm is used to illuminate normally two glass plates 26 cm in length that touch at one end and are separated at the other end by a wire of radius 0.03 mm. How many bright fringes appear along the total length of the plates?

Homework Equations

2*t=(m+1/2)*wavelength

The Attempt at a Solution

I thought t would be .6 since that would be the diameter. Then I solved for m and got 228. However webassign doesn't like this answer and I am not really sure how to go about this problem

 

[Doc Al]

You solved for the maximum value of m, but realize that m starts at zero.

 

[nickredsox]

im not really understanding because if i solve for t when m=0 if i plug it back in and solve for m I am just going to get 0

 

[Doc Al]

You're missing my point. The values of m: 0, 1, 2, 3, 4... If the maximum value of m = 4 (pretend), then how many values of m are there?

 

[nickredsox]

there would be five. so for my answer it should be one more than the answer i already got (228)?

 

[Doc Al]

That's what I would put.

 

[nickredsox]

thank you a lot it worked