COMEDK · Physics · 25. Ray Optics
A ray of light passing from glass to water is incident on the glass-water interface at \(65^{\circ}\). If the critical angle for the pair of media is \(63^{\circ}\).
- A The ray will emerge into water with a deviation of \(2^{\circ}\) from the normal
- B The ray will be refracted into water with a deviation of \(2^{\circ}\)
- C The ray will be totally internally reflected back into glass with a deviation of \(50^{\circ}\)
- D The ray will be totally internally reflected back into glass with a deviation of \(2^{\circ}\)
Answer & Solution
Correct Answer
(C) The ray will be totally internally reflected back into glass with a deviation of \(50^{\circ}\)
Step-by-step Solution
Detailed explanation
Given, \(i=65^{\circ}\) and \(i_{c}=63^{\circ}\) Since, \(i>i_{c}\), so the ray undergo total internal reflection. The angle of deviation, \(d=\pi-2 i\) \[ =180^{\circ}-2\left(65^{\circ}\right)=180^{\circ}-130^{\circ}=50^{\circ} \]
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