Question

Select the most appropriate word from the given box and fill in the following blanks.

normal 48.6° ray red refractive index vacuum 41° refraction 2.3

The ______ colour has the longest wavelength.

Answer 1

The red colour has the longest wavelength.

Explanation:

In the visible spectrum (VIBGYOR), red light has the longest wavelength (around $8000\text{ \AA}$) and violet light has the shortest wavelength (around $4000\text{ \AA}$).