πŸ“ OCR A Physics Paper 3 prep guide β€” last-minute revision, hints & synoptic topics

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AS Β· Waves & Optics: Refraction and TIR (Module 4)

A narrow laser beam travels inside a glass block (refractive index 1.50) and strikes the glass–air boundary from the glass side. As the angle of incidence inside the glass is slowly increased, at roughly what angle to the normal will total internal reflection just begin?

A2 Β· Thermal physics I (M5)

In a lab, identical 0.50 kg samples of water and an unknown liquid X are heated by the same immersion heater for the same time. Both start at 20 C. After heating, the water is at 25 C while liquid X is at 28 C. Assume negligible heat loss and no phase change. Which statement about the specific heat capacity of X compared with water is correct?

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