Question

Which of the following statements are correct?
(A) Total internal reflection occurs when a ray of light travels from a rarer transparent medium to a denser medium.
(B) In total internal reflection, the incident ray of light remains in the same medium after reflection.
(C) In total internal reflection, the angle of incidence inside the denser transparent medium is equal to the angle of reflection in the same medium.
(D) In total internal reflection inside a denser medium there is no angle of refraction
Choose the correct answer from the options given below:

• A. (B) and (C) only
• B. (A) and (B) only
• C. (B), (C) and (D) only
• D. (C) and (D) only

Hint:

Remember the two key conditions for TIR: 1) Denser to rarer medium. 2) Angle of incidence must be greater than the critical angle. Once TIR occurs, it's a reflection event, so all the standard laws of reflection apply.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
This question tests the conditions and phenomena associated with Total Internal Reflection (TIR). We need to evaluate each statement for its correctness.

Step 2: Detailed Explanation:
(A) Total internal reflection occurs when a ray of light travels from a rarer transparent medium to a denser medium.
This is incorrect. A necessary condition for TIR is that the light must travel from a denser medium to a rarer medium. So, this statement is false.
(B) In total internal reflection, the incident ray of light remains in the same medium after reflection.
The term "reflection" itself implies that the ray bounces back into the original medium. In total internal reflection, the entire ray is reflected, so it certainly remains in the same (denser) medium. This statement is true.
(C) In total internal reflection, the angle of incidence inside the denser transparent medium is equal to the angle of reflection in the same medium.
Total internal reflection is still a reflection phenomenon. Therefore, it must obey the laws of reflection. The first law of reflection states that the angle of incidence is equal to the angle of reflection (\(i=r\)). This statement is true.
(D) In total internal reflection inside a denser medium there is no angle of refraction.
TIR occurs when the angle of incidence exceeds the critical angle. Under this condition, no light passes into the rarer medium, meaning there is no refracted ray. Consequently, there is no angle of refraction to be measured. This statement is true.

Step 3: Final Answer:
Statements (B), (C), and (D) are correct, while statement (A) is incorrect. The correct option is the one that includes (B), (C), and (D).