Question

How does the speed of light waves in glass affect a plane wave passing through a thin prism?

Options

• The speed determines the intensity in the photon picture.

• The speed of light waves is less in glass.

• The speed equals the frequency of oscillation.

• The speed is slower near the edge of the lens.

Answer 1

Light waves travel more slowly in glass. A portion of the wavefront that travels through more glass is therefore delayed more.