If ε0andμ0 are respectively the permittivity and magnetic permeability of free space, ε and μ are the corresponding quantities in a medium. The refractive index of the medium is-
A
√μεμ0ε0
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B
μεμ0ε0
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C
√μ0ε0με
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D
(μεμ0ε0)2
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Solution
The correct option is A√μεμ0ε0 The refractive index of the medium (n) is given by,
Refractive index=velocity of light in vacuum(c)velocity of light in medium(v)
∵c=1√μ0ε0
n=1√μ0ε01√με=√μεμ0ε0=√μrεr
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Hence, (A) is the correct answer.