The speed of light in glass is 2 \times 10^5 {\km} \/ { s}. What is the refractive index of glass?

ICSE Class 10 Physics 2015 Solved Paper - Question 19

Question : 19 of 74

Marks: +1, -0

The speed of light in glass is

2 × 10^5 {\km} \/ {\ s}

.
What is the refractive index of glass?

Solution:

Refractive index of glass

\;=\;{\;\text " Speed of light in vacuum "\;}/{\;\text " Speed of light in glass "\;}

\;=\;{3 × 10^8 {\m} \/ {\ sec}}/{2 × 10^5 {\km} \/ {\ sec}}

\;=\;{3 × 10^8 {\m} \/ {\ sec}}/{2 × 10^8 {\m} \/ {\ sec}}

\;=1.5 \;\;

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