week08 - This week Please hand in or upload to elms Lab3...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: This week Please hand in or upload to elms Lab3 lab report HW 5 due next class (after spring break) Today we start lab 4 (continued after spring break) Fabry-Perot Since n depends on lambda, difference in path length depends on lambda Thin Film δ =( k 2 i s 2 − k 1 • s 1 ) + φ 2 − φ 1 k 2 = nk 1 also φ 2 = φ 1 for normal incidence δ = k ( n 2 t ) (n2t is effective difference in path length) δ = 2 π : constructive interference 2 π λ n 2 t = 2 π λ = 2 nt : constructive interference if phase change on reflection is same for both reflections. if opposite, need to add π : destructive interference For normally incident rays: I total = 4 I cos 2 δ 2 Thin films δ = n 2 2( L + d ) − n 1 D sin θ = D 2 w and sin α = d w n 1 sin θ = n 2 sin α n 1 D 2 w = n 2 d w d = n 1 2 n 2 D δ = 2 n 2 L cos α = L t (see bottom α in pic) δ =2n 2 t cos α if no change of phase on reflection, constructive interference for 2n 2 t cos α = m λ If rays are not normally incident… Previous works if the source is far away. If instead we have a point source near by: Looks like 2 narrow slits e with source spacing along the line as shown… Don’t need lens to see fringes...
View Full Document

This note was uploaded on 12/29/2011 for the course PHYSICS 375 taught by Professor Eno during the Spring '11 term at Maryland.

Page1 / 13

week08 - This week Please hand in or upload to elms Lab3...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online