[PPSC SUPDT. HOME DSSO, 2024]

49. An object is immersed in a fluid. In order that the object becomes invisible, it should

1. behave as a perfect reflector, but must not obey Snell's Law.

2. Have Specific Gravity of 0.

3. Have Refractive Index as 1.

4. Have Refractive Index matching with that of the surrounding fluid.

Correct Answer :

Have Refractive Index matching with that of the surrounding fluid.