Question

The phenomenon, which is not due to total internal reflection is

• A. mirage on hot summer days.
• B. brilliance of diamond
• C. difference between apparent real depth of a pond
• D. working of optical fibre.

Hint:

Identify which listed effect arises from ordinary refraction at a surface rather than from total internal reflection.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept
Total internal reflection occurs when light goes from a denser to a rarer medium at an angle larger than the critical angle.

Step 2: Check each phenomenon
Mirage, sparkle of a diamond and light travel in an optical fibre all depend on total internal reflection.

Step 3: Apparent depth
The difference between apparent and real depth of a pond is due to ordinary refraction at the water surface, with no total reflection involved.

Final Answer:
The difference between apparent and real depth is not due to total internal reflection. \[ \boxed{\text{(C) }\text{difference between apparent real depth of a pond}} \]