Problem

• In a double slit expt the distance between slits is d=5.0 mm and the distance to the screen is D=1.0 m. There are two interference patterns on the screen: one due to light with ?1=480 nm and another due light with ?2=600 nm. What is the separation between third order(m=3) bright fringes of the two patterns?

• Note: same d,D but different ? => one pattern magnified

• d/D= 5 x 10-3 => sin? ~tan ? ~ ?

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