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Home/ Questions/Q 896
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Trayi Goyal
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Trayi Goyal
Asked: October 20, 20202020-10-20T12:19:46+00:00 2020-10-20T12:19:46+00:00In: Class 10

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

2020-2021cbsechapter 10class10light – reflection and refractionncertscience
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    1. Biology Genius
      2020-12-12T06:33:41+00:00Added an answer on December 12, 2020 at 6:33 am

      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. Baldev
      2021-01-30T07:45:54+00:00Added an answer on January 30, 2021 at 7:45 am

      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. Anshita
      2021-01-30T09:06:07+00:00Added an answer on January 30, 2021 at 9:06 am

      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. om kishan
      2023-11-21T08:31:09+00:00Added an answer on November 21, 2023 at 8:31 am

      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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