jazzchan
Apr11-04, 03:42 PM
Dear all,
the question is ...
Two flat glass plates touch at one edge and are separated at the other edge by a spacer. Using vertical viewing and light is 589 nm(wavelength), five dark fringes(D) are obtained from edge to edge. What is the thickness of the spacer ??
i know that the thinkness of space(T) = m(1/2wavelength), but
would u mind to give me some idea for what is the m ?? is 4 or 5 ??
I think it is 5.....but i checked the correct answer is 4 ?? why ?? because of 'from edge to edge' ??
best regards and thanks
JazzChan
the question is ...
Two flat glass plates touch at one edge and are separated at the other edge by a spacer. Using vertical viewing and light is 589 nm(wavelength), five dark fringes(D) are obtained from edge to edge. What is the thickness of the spacer ??
i know that the thinkness of space(T) = m(1/2wavelength), but
would u mind to give me some idea for what is the m ?? is 4 or 5 ??
I think it is 5.....but i checked the correct answer is 4 ?? why ?? because of 'from edge to edge' ??
best regards and thanks
JazzChan