Question

when light passes from a denser to rarer me obliquely what happens to its path? what happens to it's speed​

Answer 1

Answer:

if light travels from a denser medium to a rarer medium then it actually bends away from the normal as the speed of light increases as it enters the rarer(hence faster) medium

Answer 2

Answer:

When a light ray enters from a denser to rarer medium the ray bend away from the normal. such that the angel of is 'i' and the angle of refraction is 'r' for a particular value of angel of incidence the refracted ray becomes  90°.the angle of incidence that causes the refracted ray to bend at 90°is called critical angle. When the angle of incidence becomes greater than the critical angle no refraction occurs. this phenomenon is known as total internal refraction. the speed of light is given by the formula

sin i /sin r = n

which is also known as snells law