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Refraction

The phenomenon of bending of light at the interface separating the two media when it travels from are medium to another is called refraction of light.

Refraction through a Glass Slab

$Refraction through a Glass Slab$

For direct light:

At surface PQ,

${U}_{ga}=\frac {\sin {i}} {\sin {r}}\, \, \, \, \, -------eq(1)$

At surface RS,

${U}_{ag}=\frac {\sin {r}} {\sin {i}}\, ------eq(2)$

For reflected light :

At surface RS,

${U}_{ga}=\frac {\sin {e}} {\sin {r}}\, ------eq(3)$

At surface PQ,

${U}_{ag}=\frac {\sin {r}} {\sin {i}}\, ------eq(4)$

From eq(1) and eq(4)

${U}_{ga}=\frac {1} {{U}_{ag}}$

From eq(2) and eq(3)

$\frac {\sin {i}} {\sin {r}}=\frac {\sin {e}} {\sin {r}}\, \, \, i.e\, Li\, =\, Le$

Provided :

Refracting surface parallels to each other.

Refraction through a Multiple Media:

$Refraction through a Multiple Media:$

Prem Prakash Singh

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