A student investigates the refraction of light through a semicircular glass block. The straight boundary of the block is aligned with a line $A B$ , and $C$ is the midpoint of $A B$ . A normal line $N L$ is drawn perpendicular to $A B$ through $C$ .

State the minimum recommended distance that the student should space the locator pins along a ray line, and give one other precaution they should take to ensure the ray trace is as accurate as possible.

In one configuration, the student traces an emerging ray $GC$ and measures the acute angle $α\alpha$ between this ray and the flat face boundary $A B$ to be $71∘71^\circ$ . Calculate the angle $β\beta$ between the ray $GC$ and the normal $N L$ .

A classmate suggests that this angle $β\beta$ should theoretically be $20∘20^\circ$ . State whether the student's experimental result supports this classmate's suggestion, and justify your answer, referring to experimental accuracy.

3.2.2 Refraction of light

Question 43

Markscheme

3.2.2 Refraction of light

Question 43

Markscheme

3.2.2 Refraction of light

Question 43

3.2.2 Refraction of light Questions

3.2.2 Refraction of light

Question 43

3.2.2 Refraction of light Questions