In denser medium,particles of matter are very close to each other.whereas,in rarer medium,particles of the medium are slightly farther apart.
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If one considers reflective indicies, if the reflective index of the second medium (n2) is larger than the first (n1), the ray bends towards the normal. This means that n2 > n1Since n is defined as c/v, we know that the speed of light is greater in the first medium. Thus, when light changes speed from fast to slow, it bends towards the normal.
refraction
Refraction occurs because waves move at different speeds in different bodies. Because a wave hits the other medium at an angle, part of the wave changes speed earlier than the rest, turning the waves. this is most obvious with light waves in water, but it happens with all types of waves in any change of medium.
There are rarer fossils, as in fossils that belong to creatures that haven't been discovered yet or are very uncommon, but no "best" fossil.
its common. They are avalible in stores everywhere.