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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. - Science

Sum

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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#### Solution

Refractive index of a medium nm is given by,

n_m="speed of light in vacuum"/"Speed of light in the medium"="c"/"v"

Speed of light in vacuum, c = 3 × 10m s−1

Refractive index of glass, ng = 1.50

Speed of light in the glass,  "v"= "c"/n_g=(3xx10^8)/1.50=2xx10^8 "ms"^(-1)

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#### APPEARS IN

NCERT Class 10 Science Textbook
Chapter 10 Light – Reflection and Refraction
Q 2 | Page 176
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