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A student does an experiment to determine the critical angle for glass - Edexcel - GCSE Physics - Question 8 - 2023 - Paper 1
Question 8
A student does an experiment to determine the critical angle for glass. The student shines a ray of light into a semicircular glass block and measures the angles i a... show full transcript
Worked Solution & Example Answer:A student does an experiment to determine the critical angle for glass - Edexcel - GCSE Physics - Question 8 - 2023 - Paper 1
Step 1
The ray of light does not change direction when it enters the glass block at point X.
Answer
The correct explanation is A. The ray enters along a normal to the edge of the block. When light travels from one medium to another, it changes direction only if it does not enter along the normal. Since the ray is entering at a normal, it continues in the same path without bending.