# A glass plate inside a colorless liquid becomes invisible because:(A) the densities of both are same(B) the refractive indices of both are same(C) the colors of both are same(D) liquid wets glass surface

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Hint:We are supposed to tell why the glass plate is invisible. In order to do this, consider the various phenomena that will occur inside or outside the glass plate, the reflection and refraction at the interface of the glass plate and colorless liquid. Also look for the light rays inside and outside the glass plate. Create a situation such that the glass plate will be invisible.

from Snell's Law, we will have $n\sin i = n\sin r$, as the refractive indices are considered to be the same. From here, we will get an angle of incidence that is equal to the angle of refraction, which means that the light rays will not deviate from its actual path and thus refraction does not occur. The light will not reflect as well because as there is no change in the refractive index, it will continue along its original path.