COMEDK · Physics · 25. Ray Optics
The critical angle for a typical glass air interface is \(42^\circ\). If a ray of light falls normally on one of the faces of the prism of angle \(45^\circ\). The emergent ray will:
- A Will pass parallel to the second surface
- B Undergo total internal reflection from the second face
- C Will undergo refraction with a refracting angle \(45^\circ\)
- D Go undeviated
Answer & Solution
Correct Answer
(B) Undergo total internal reflection from the second face
Step-by-step Solution
Detailed explanation
Given critical angle \(C = 42^\circ\). Angle of prism \(A = 45^\circ\). Since the ray falls normally on the first face, the angle of incidence \(i_1 = 0^\circ\). Thus, the angle of refraction at the first face \(r_1 = 0^\circ\). Using the relation for a prism, \(r_1 + r_2 = A\).…
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