इंद्रधनुष के सात रंग अंदरूनी किनारे से बाहरी किनारे की ओर किस मानक अनुक्रम में व्यवस्थित होते हैं?

A light ray incident on a plane mirror makes an angle of 30° with the mirror surface. What is the angle made by the reflected ray with the normal?

After refraction of a plane wave incident on a rarer medium, the wave front / ray ______.

What does the acronym LASER stand for in the context of light technology?