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2016-05-02T20:00:47+05:30

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Medium 2 is optically denser as the angle of refraction is less than the angle of incidence...
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2016-05-03T13:59:24+05:30

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When the light ray passes from an optically lighter to denser medium, the light ra y  bends towards the normal to the interface at the point of incidence.  That means that the angle of refraction is less in the denser medium.

In the given example, medium 1  is the lighter one and medium2 is denser.
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The actual reason for the bending of light ie., angle of refraction being smaller than angle of incidence is because of speed of light being less in a denser medium.  Light rays travel with less speed due to optical resistance faced.

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formula wise,        μ₁ sin i  =   μ₂  sin r
                               i  = x  >  r = x/2,  so    μ₂  > μ₁

   so medium 1 is lighter as refractive index is less.   Refractive index of vacuum (lightest) is 1 and all other media have that more than 1.

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