The angle of incidence \( i \) and angle of refraction \( r \) are equal in a transparent slab w...

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The angle of incidence \( i \) and angle of refraction \( r \) are equal in a transparent slab when the value of \( i \) is
a. \( 45^{\circ} \)
b. \( 0^{\circ} \)
c. \( 60^{\circ} \)
d. depend on the material of the slab
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