The diagram below shows a light source P embedded in a rectangular glass block ABCD of critical angle 42 $°$ . Complete the path of the ray PQ till it emerges out of the block [Write necessary angles].

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Solution

Angle of incidence =48 $°$ >( $i_{c}$ )
∴ TIR takes place
The ray is now incident on surface CD at B, hex angle of incidence =42 $°$
∴ Angle of refraction =90 $°$

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The diagram below shows a light source P embedded in a rectangular glass block ABCD of critical angle 42°. Complete the path of the ray PQ till it emerges out of the block [Write necessary angles].

Angle of incidence =48°>(ic​) ∴ TIR takes place The ray is now incident on surface CD at B, hex angle of incidence =42° ∴ Angle of refraction =90°

The diagram below shows a light source P embedded in a rectangular glass block ABCD of critical angle 42 $°$ . Complete the path of the ray PQ till it emerges out of the block [Write necessary angles].

Angle of incidence =48 $°$ >( $i_{c}$ )
∴ TIR takes place
The ray is now incident on surface CD at B, hex angle of incidence =42 $°$
∴ Angle of refraction =90 $°$