Mirage

Q. How to know where we have to use (2n-1) And where to use (2n+1) in wave optics for minima in ydse

Q. how many wavelengths of Kr86 are there in 1 metre

Q.

The formation of mirage is a consequence of :

1. Varying R.I & TIR

2. Varying R.I

3. TIR

4. None of them

Q. The formation is mirage is due to:

1. Scattering
2. TIR
3. Cosmic lensing
4. None of them