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CAIE IGCSE Physics Light Through Transparent Media

Practise tracing light across one transparent boundary, linking its change of speed to bending toward or away from the normal while normal incidence stays straight.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • draw a ray bending away from the normal when it enters a medium where light travels faster
  • keep a ray on the normal undeviated and identify the boundary where its speed changes

3.2.2.3—Passage of light through a transparent question 1

[Maximum number: 2]

Fig. 5.1 shows four rays of red light, P, Q, R and S, coming from a spotlight in a swimming pool.

Fig. 5.1

Fig. 5.1

On Fig. 5.1, draw the path of rays P and Q at the water-air boundary.

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