A ray of light incident on a rectangular glass slab immersed in any medium emerges parallel to itself.

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Solution

$n_{1} s i n v = n_{2} s i n r_{1}$
Also
$n_{2} s i n r_{2} = n_{1} s i n e$
As $r_{1} = r_{2}$
$∴ n_{1} s i n v = n_{1} s i n e \Rightarrow s i n i = s i n e$
$∴ i = e$

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A ray of light incident on a rectangular glass slab immersed in any medium emerges parallel to itself.

n1sinv=n2sinr1 Also n2 sinr2=n1sin e As r1=r2 ∴n1sinv=n1sin e⇒sin i=sin e ∴i=e

$n_{1} s i n v = n_{2} s i n r_{1}$
Also
$n_{2} s i n r_{2} = n_{1} s i n e$
As $r_{1} = r_{2}$
$∴ n_{1} s i n v = n_{1} s i n e \Rightarrow s i n i = s i n e$
$∴ i = e$