During a physics laboratory session, a student investigates the refraction of a ray of light passing through a rectangular transparent block using the pin-pointing method.
The student places two pins, P1P_1P1 and P2P_2P2, to define the path of the incident light ray before it enters the block.
Suggest a suitable minimum distance between pin P1P_1P1 and pin P2P_2P2.
State why placing these pins too close together would lead to inaccuracies in the traced ray.
State two precautions, other than pin separation, that should be taken during this ray-tracing experiment to ensure high accuracy.
The student wants to investigate if the ratio of the sine of the angle of incidence to the sine of the angle of refraction (sinisinr\frac{\sin i}{\sin r}sinrsini) is constant for different values of iii. State five suitable values of the angle of incidence iii that the student could use to thoroughly test this relationship.
100 exam-style questions on CIE IGCSE Physics 3.2.2 Refraction of light. Each one has a worked solution and a mark scheme showing where the marks go.