What should be the refractive index of a transparent medium to be invisible in vacuum?
A
1
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B
< 1
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C
> 1
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D
None of these
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Solution
The correct option is A 1 Transparent medium become invisible in vacuum if its refractive index becomes equal to 1, since refractive index of vacuum is also unity because of which refraction of light will not take place in the transparent medium.