Question

Which of the following conditions is not necessary for refraction to occur?

• A. Both the incident and refracting substances must be transparent.
• B. Both substances must have different refractive indices.
• C. The light must enter at an angle greater than 0 with respect to the normal.
• D. The light must have only one wavelength.

Answer 1

The correct option is D The light must have only one wavelength.

For refraction to occur substances must be transparent and light ray must pass from region of one index of refraction to another i.e. both substances should have different refractive indices should and the light ray must impinge at an angle other than normal which must not be less than the critical angle.