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WalesPhysicsQuick questions
Unit 2 Electricity and Light
Quick questions on Refraction of light: Snell's law and total internal reflection - WJEC A-Level Physics
3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are optical fibres?Show answer
An optical fibre has a core of high refractive index surrounded by cladding of lower index. Light hits the core-cladding boundary above the critical angle and is totally internally reflected repeatedly, so it travels along the fibre with little loss, the basis of high-speed communications and endoscopes.
What is q1?Show answer
Light passes from glass () into air. Find the critical angle. [2 marks]
What is q2?Show answer
State what happens to light meeting a boundary at an angle greater than the critical angle. [1 mark]
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