A ray of light travels from air into a transparent glass prism. At the first boundary, it refracts. It then travels through the glass and strikes the second boundary at the critical angle, such that the refracted ray emerges along the boundary surface.

Let:

$i\,$ be the angle of incidence at the first boundary.
$r\,$ be the angle of refraction at the first boundary.
$c\,$ be the critical angle at the second boundary.

Which option correctly describes how these three angles must be measured in a ray diagram?

$i$ is measured between the incident ray in air and the normal.
$r$ is measured between the refracted ray in the glass and the normal.
$c$ is measured between the ray inside the glass and the normal to the second boundary.

$i$ is measured between the incident ray in air and the normal.
$r$ is measured between the refracted ray in the glass and the first boundary surface.
$c$ is measured between the ray inside the glass and the second boundary surface.

$i$ is measured between the incident ray in air and the first boundary surface.
$r$ is measured between the refracted ray in the glass and the normal.
$c$ is measured between the ray inside the glass and the second boundary surface.

$i$ is measured between the incident ray in air and the first boundary surface.
$r$ is measured between the refracted ray in the glass and the first boundary surface.
$c$ is measured between the ray inside the glass and the normal to the second boundary.

Let:

$i\,$ be the angle of incidence at the first boundary.
$r\,$ be the angle of refraction at the first boundary.
$c\,$ be the critical angle at the second boundary.

Which option correctly describes how these three angles must be measured in a ray diagram?

$i$ is measured between the incident ray in air and the normal.
$r$ is measured between the refracted ray in the glass and the normal.
$c$ is measured between the ray inside the glass and the normal to the second boundary.

$i$ is measured between the incident ray in air and the normal.
$r$ is measured between the refracted ray in the glass and the first boundary surface.
$c$ is measured between the ray inside the glass and the second boundary surface.

$i$ is measured between the incident ray in air and the first boundary surface.
$r$ is measured between the refracted ray in the glass and the normal.
$c$ is measured between the ray inside the glass and the second boundary surface.

$i$ is measured between the incident ray in air and the first boundary surface.
$r$ is measured between the refracted ray in the glass and the first boundary surface.
$c$ is measured between the ray inside the glass and the normal to the second boundary.

3.2.2 Refraction of light

Question 49

Markscheme

3.2.2 Refraction of light

Question 49

Markscheme

3.2.2 Refraction of light

Question 49

3.2.2 Refraction of light Questions

3.2.2 Refraction of light

Question 49

3.2.2 Refraction of light Questions