A ray of light incident at an angle \(\theta\) on a refracting face of a prism emerges from the other face normally. If the angle of the prism is \(5^{\circ}\) and the prism is made of a material of refractive index \(1.5\), the angle of incidence is:
1. \(7.5^{\circ}\)
2. \(5^{\circ}\)
3. \(15^{\circ}\)
4. \(2.5^{\circ}\)
Subtopic:  Prisms |
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