In refraction practicals, shine a ray into a glass block. Draw the normal at the boundary and measure the incident and refracted angles from it.
A student does an investigation to determine the refractive index of a block made from flint glass.
She directs a ray of red light at the block, as shown in diagram 1.
Diagram 1
Use a protractor to determine the angle of incidence and the angle of refraction of the red light at point A on diagram 1.
angle of incidence = ...... degrees
angle of refraction = ...... degrees