All I need today is a little bit of Alabama and a whole lot of Jesus shirt

As such the focal length will not change in case of All I need today is a little bit of Alabama and a whole lot of Jesus shirt on the refractive index of the medium (unlike lenses). This would be the case if the incident ray originates from a point in the water. However, if you are considering the mirror immersed in water as a wholesome convex mirror, the case is different – the incident light from air (supposedly) first refracts in water and then hits the reflecting surface. Higher the refractive index of the material of the medium of traversal (in this case water), higher is the deviation from path of incidence and so, effectively, higher the focal length.

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Best All I need today is a little bit of Alabama and a whole lot of Jesus shirt

It is true that the total reflected light increases with angle of All I need today is a little bit of Alabama and a whole lot of Jesus shirt, but the reflectance for the two primary linear polarization states is dramatically different. In fact, one state, the vertical polarization, actually goes through a minimum of zero. This is why you can wear polarized sunglasses and filter out a lot of the reflection. The angle of incidence where this minimum occurs is called Brewster’s angle and is very useful for polarization studies. However, near grazing incidence, both polarization states are highly reflected and polarized sunglasses are ineffective for very still water when viewed at grazing incidence, leaving a totally mirror-like reflection.