Trayi Goyal
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Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 × 108 m s–1.

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NCERT Solution for Class 10 Science Chapter 10
Light – Reflection and Refraction
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-176
Questions No-2

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4 Answers

  1. Refractive index of a medium nₘ is given by,
    nₘ = Speed of light in vacuum / Speed of light in the medium = c/v
    Speed of light in vacuum, c = 3 × 10⁸ m s−¹
    Refractive index of glass, n = 1.50
    Speed of light in the glass, v = c/n = 3×10⁸ m s−¹
    Refractive index of glass, n = 1.50
    Speed of light in the glass, v= c/n = 3×10⁸/1.50 = 2×10⁸ ms−¹

    For more answers visit to website:
    https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-10/

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  2. Refractive index of a medium, nm = Speed of light in vacuum/Speed of light in the medium
    Speed of light in vacuum, c = 3 × 108 ms-1
    Refractive index of glass, ng = 1.50
    Speed of light in the glass, v = Speed of light in vacuum/ Refractive index of glass
    = c/ng
    =3 × 108/1.50 = 2x 108 ms-1.

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  3. Speed of light in vacuum, c = 3 × 10⁸ m s−¹
    Refractive index of glass, n = 1.50
    Speed of light in the glass, v = c/n = 3×10⁸ m s−¹
    Refractive index of glass, n = 1.50
    Speed of light in the glass, v= c/n = 3×10⁸/1.50 = 2×10⁸ ms−¹

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  4. The speed of light in a medium is related to its refractive index (n) by the equation:

    v = c/n

    where:

    » v is the speed of light in the medium,
    » c is the speed of light in a vacuum,
    » n is the refractive index of the medium.

    In this case, the refractive index (n) of glass is given as 1.50, and the speed of light in a vacuum (c) is 3 ×10⁸ m/s

    Substituting these values into the equation, we get:
    v = 3 ×10⁸ m/s/1.50
    v = 2 ×10⁸ m/s
    So, the speed of light in the glass is 2×10⁸ m/s.

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