Dear Student, According to snails law at point O for incident ray μ=sin(i1)sin(r1)-----1and point O' for emergent ray 1μ=sin(i2)sin(r2)or μ=sin(r2)sin(i2)----2equation 1 and 2 will only then satishfy when r2=i1and r1=i2 Regards

Q. Prove that i1 = r2

Dear Student,

A c c o r d i n g t o s n a i l s l a w a t p o i n t O f o r i n c i d e n t r a y μ = \frac{\sin (i_{1})}{\sin (r_{1})} - - - - - 1 a n d p o i n t O' f o r e m e r g e n t r a y \frac{1}{μ} = \frac{\sin (i_{2})}{\sin (r_{2})} o r μ = \frac{\sin (r_{2})}{\sin (i_{2})} - - - - 2 e q u a t i o n 1 a n d 2 w i l l o n l y t h e n s a t i s h f y w h e n r_{2} = i_{1} a n d r_{1} = i_{2}

Regards

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