1)

 A beam of light propagating at an angle α1  from a medium 1 through to another medium 2 at an angle α2. If the wavelength of light in medium 1 is λ1 , then the wavelength of light in medium 2, (λ2) , is 


A) sinα2sinα1λ1

B) sinα2sinα1λ2

C) (α1α2)λ1

D) λ1

Answer:

Option A

Explanation:

 We know that ,

  λ=λ0μ

 According to the question,

    sinα1sinα2=μ2μ1=λ1λ2

  λ2=λ1sinα2sinα1