Refraction

• In general v = ?f and ? changes if v does

• in vacuum c = ?f

• in a medium c/n = ?nf

• hence ?n = ?/n which is less than ?

• consider two light waves which are in phase in air (n=1) and each passes through a thickness L of different material

upper wave has ?2= ?/n2

lower wave has ?1= ?/n1

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