Refraction of light at a plane surface
- 1. IMPORTANT THEORY QUESTIONS Refraction of Light at a Plane Surface : Total Internal Reflection Prepared by : Mukesh N Tekwani Email: [email protected] Sr No Question Marks Keyword(s) 1 Define the term ‘refraction of light’ 1 Define 2 State the laws of refraction. 2 Laws of refraction 3 State Snell’s law of refraction and give the equation relating refractive index with angle of incidence and angle of refraction. 3 Snell’s law 4 Why does refraction of light occur? 1 Refraction 5 What information do we get from the refractive index of a material? 2 RI 6 What is the SI unit of refractive index? Explain your answer. 1 SI unit 7 State the principle of reversibility of light. Draw a neat ray diagram to explain this concept. 2 Reversibility of light. 8 If 1n2 and 2n1 are the refractive indices of medium 2 relative to medium 1, and medium 1 relative to medium 2 respectively, then what is the relation between 1n2 and 2n1? 1 Formula 9 Derive an expression for the refraction of light passing through multiple media like air, water, glass and back into air. 5 Derive 10 For refraction through parallel multiple media, show that 1n3 = 1n2 x 2n3 5 Derive 11 Define ‘real depth’ and ‘apparent depth’ Illustrate these terms with a neat diagram. 2 Define, diagram 12 Define ‘critical angle’ and ‘total internal reflection’ 2 Define 13 State the two conditions that must be fulfilled for total internal reflection to occur. 2 TIR 14 Obtain the relation between refractive index and critical angle. Assume Snell’s law equation. 2 Derive 15 What is a mirage? Explain. 2 Mirage 16 Explain, with neat ray diagram, the construction and working of a simple reflecting prism. 3 Reflecting Prism 17 Explain, with neat ray diagram, the construction and working of a reversing prism. 2 Reversing Prism 18 Explain, with neat ray diagram, the construction and working of an erecting prism. 2 Erecting Prism 19 State the advantages of totally reflecting prisms over plane mirrors. 2 Prisms (c)M ukesh N Tekw ani
- 2. © Mukesh N Tekwani ([email protected]) 20 Why does a diamond sparkle brilliantly when seen along certain directions? 2 TIR 21 State the names of three types of totally reflecting prisms. What are the advantages of these prisms over a plane mirror? 2 Prisms 22 Describe the construction, working and principle of operation of an optical fibre. 5 Optical fibre 23 State any three applications of optical fibres. 3 Optical fibre 24 Explain refraction of light and write its laws. Derive the relation n = Real depth / Apparent depth 5 Derive Page 2 (c)M ukesh N Tekw ani