Assertion: An excessively thin film appears dark in reflected light.

Reason: The film absorbs selected radiations falling on it.

To demonstrate the phenomenon of interference, we require two sources which emit radiation

Two identical light sources $s_{1}$ and $s_{2}$ emit light of same wavelength $\lambda$. These light rays will exhibit interference if their

On which of the following quantities, the Intensity of light depends on

The destructive interference at a certain point is produced when two coherent light waves superpose at that point with a phase difference of

Two coherent sources produce a dark fringe, when the phase difference between the interfering beams is