Snell’s Law and Refractive Index Numerical Class-12 Nootan ISC Physics Solution Ch-15 Refraction of Light at a Plane Interface : Total Internal Reflection : Optical Fabre. Step by step solutions of Kumar and Mittal Physics of Nageen Prakashan as council latest prescribe guideline for upcoming exam. Visit official Website CISCE for detail information about ISC Board Class-12 Physics.
Snell’s Law and Refractive Index Numerical Class-12 Nootan ISC Physics Solution Ch-15 Refraction of Light at a Plane Interface : Total Internal Reflection : Optical Fabre
| Board | ISC |
| Class | 12 |
| Subject | Physics |
| Book | Nootan |
| Chapter-15 | Refraction of Light at a Plane Interface |
| Topics | Numericals on Snell’s Law and Refractive Index |
| Academic Session | 2025-2026 |
Numericals on Snell’s Law and Refractive Index
Class-12 Nootan ISC Physics Solution Ch-15 Refraction of Light at a Plane Interface : Total Internal Reflection : Optical Fabre.
Que-1: The refractive index of diamond relative to air is 2.42 and that of glass is 1.51. How much faster does light travel in glass than in diamond?
Ans- ng/nd = vd/vg
=> 1.51/2.42 = vd/vg
=> vd = 2.42 vg / 1.51
=> vd = 1.60 vg
Que-2: A ray of light in air is incident on a glass plate at 45°. The refractive index of glass is 1.5. What is angle of refraction?
Ans- μ = sin i / sin r
=> 1.5 = sin 45 / sin r
=> sin r = sin 45 / 1.5
=> sin r = 0.47
=> r = sin^-1 0.47
=> r = 28°
Que-3: A ray of light which is incident in air on the surface of a glass block is deviated through 15°. The angle of incidence in air is 60°. What is the angle of refraction in glass? Also calculate the critical angle for glass-air interface. (ISC 2002)
Ans- i = 60° , r = 60-15 = 45°
ic = sin^-1 1/μ
=> sin^-1 (sin i / sin r)
=> sin^-1 (sin 45 / sin 60)
=> sin^-1 (√(2/3))
=> 54.7°
— : End of Snell’s Law and Refractive Index Numerical Class-12 Nootan ISC Physics Solution Ch-15 .–
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