The speed of light is maximum in

$A$ beam of light propagating in medium $A$ with index of refraction $n(A)$ passes across an interface into medium $B$ with index of refraction $n(B)$. The angle of incidence is greater than the angle of refraction; $v(A)$ and $v(B)$ denote the speed of light in $A$ and $B$. Then which of the following is true?

When light is refracted from air into glass,

An object is immersed in a fluid of refractive index $\mu$. In order that the object becomes invisible when observed from outside,it should

$A$ boat has a green light of wavelength $\lambda = 500 \ nm$ on the mast. What wavelength would be measured and what colour would be observed for this light as seen by a diver submerged in water by the side of the boat? Given,$n_{w} = 4/3$.

$A$ ray of light is incident on the surface of separation of a medium at an angle of $45^\circ$ and is refracted in the medium at an angle of $30^\circ$. What will be the velocity of light in the medium?