Physics 5054/42 — May/June 2020
Cambridge O-Level · Alternative to Practical · worked solutions for every part, with the mark scheme
Topics Experimental Contexts · Observations and Measurements · Use of Techniques, Apparatus and Materials · Analysis, Conclusions and Evaluation · Planning Experiments and Investigations
A student investigates the refraction of light by a glass block.
- She places the glass block on a sheet of paper and draws around the outline of the block.
- She uses a ray box to shine an incident ray on to the side AB, as shown in Fig. 1.1. The ray is incident at point E.
On Fig. 1.1, draw the normal at point E.
Measure and record the angle of incidence .
= ______
The ray is refracted into the block at an angle of refraction of .
On Fig. 1.1 draw the refracted ray. Continue the ray until it meets the side CD of the block. Label the point where the refracted ray meets the side CD with the letter F.
Describe how the student accurately traces the path of the light emerging from the block through side CD.
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