question_answer

A light wave is reflected from a mirror and the incident and the reflected waves superpose to form stationary, waves. Explain why nodes and antinodes are not observed, similar to that found in case of sound waves.

Answer:

                The wavelength of light is of the order of \[{{10}^{-7}}\] metre, hence the distance between the nodes or antinodes will also be of the same order. It is not possible to resolve this distance by eye or by an ordinary optical instrument.