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# What is a refractive mirror ?

Last updated date: 22nd Mar 2023
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Refractive index of the vacuum is $1$. A refractive index of $1.33$(water) means that the speed of light is $1.33$ slower in water as compared to vacuum.Refractive mirror is the one which refracts or bends the incident ray into another medium.For example, when you look at a spoon in a glass of water, the submerged part of the spoon appears to be in a different place than expected.
Note:There are two possibilities when the refraction takes place, one is when light passes from a medium of lower $n$ such as air into a medium of higher $n$, such as glass, the light ray bends towards the normal( A imaginary line which is perpendicular or normal to the surface). Second possibility is when the light passes from a medium of higher $n$ to the medium of lower $n$, it bends away from the normal direction.