Michelson Interferometer with a lens

[zefanya]

Homework Statement

This Michelson interferometer is based on a laser with a wavelength of 513 nm. The laser beam first passes though a negative lens with f = -20 mm and then through a positive lens with f = 200 mm. The distance between the lenses is 160 mm. The optical path length from the last lens to the end screen is for the first arm 1200 mm and for the second 1210 mm. How many interference fringes are visible with a radius of 80 mm?

Relevant Equations

2d = mλ
2 d = (m + 1/2)λ

Hello everyone, i have a homework but I'm so confused how to solved it , can someone make a solution manual for this homework?, Thankyou.

 

[BvU]

Hello @zefanya ,
$\qquad$ !

with a radius of 80 mm

'with' ? or 'within'? Makes a difference !

solution manual for this homework

That would only rob you of the exercise, so it is utterly unproductive. Just work your way through:

• Start with some sketches to clarify the setup
• Jotting down equations is one thing. Clarify what the symbols stand for and where they fit in the drawing
• Check if your work and the problem statement agree. Fringes ?

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