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  4. A ray of light is incident on a glass slab of thickness t, at an angle i, r is the angle of refraction in the glass slab. Distance travelled in the glass slab is

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Q. A ray of light is incident on a glass slab of thickness $t$, at an angle $i, r$ is the angle of refraction in the glass slab. Distance travelled in the glass slab is

COMEDKCOMEDK 2008Ray Optics and Optical Instruments

Solution:

image
As clear from figure,
Distance travelled in glass slab
$=OB=\frac{O C}{\cos r} $
$\Rightarrow OB=\frac{t}{\cos r}$