Question

A light beam, passes from medium 1 to medium 2. Show that the emerging beam is parallel to the incident beam.

Answer 1

Answer:

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Answer 2

when a light beam passes from medium 1 to medium 2 the emerging been it’s always parallel to the incident beam

• This can be proved by using  SNELL’S LAW μ₁sini₁=μ₂sini₂

• when the light beam passes from medium 1 to medium 2 it is known as incident ray

       Let the angle of incidence be i₁ and angle of refraction be i₂

      from snells law

       μ₁sini₁=μ₂sini₂

       μ₁/μ₂ = sini₂/sini₁……………(1)

• when the light beam passes out of the medium 2 to medium 1 it is known as emerging ray

      let the angle of emergence be i₃

      from snells law    μ₁sini₃=μ₂sini₂

     μ₁/μ₂ = sini₂/sini₃……………(2)

• By solving equations one and two we get i₁=i₃ Which says that the angle of incidence is equal to angle of emergence