When a ray of light enters a glass lens surrounded by air, it slows down. (a) As it leaves the glass, does itsspeed increase, decrease, or stay the same? (b) Choose the bestexplanation from among the following:I. Its speed increases because the ray is now propagating in amedium with a smaller index of refraction.II. The speed decreases because the speed of light decreaseswhenever light moves from one medium to another.III. The speed will stay the same because the speed of light is auniversal constant.
Refraction of Light
Refraction is a change in the direction of light rays when they travel from one medium to another. It is the bending of light when it goes through different media.
Angle of Refraction
Light is considered by many scientists to have dual nature, both particle nature and wave nature. First, Particle nature is one in which we consider a stream of packets of energy called photons. Second, Wave nature is considering light as electromagnetic radiation whereas part of it is perceived by humans. Visible spectrum defined by humans lies in a range of 400 to 700 nm wavelengths.
Index of Refraction of Diamond
Diamond, the world’s hardest naturally occurring material and mineral known, is a solid form of the element carbon. The atoms are arranged in a crystal structure called diamond cubic. They exist in a huge variety of colours. Also, they are one of the best conductors of heat and have a very high melting point.
When a ray of light enters a glass lens surrounded by air, it slows down. (a) As it leaves the glass, does its
speed increase, decrease, or stay the same? (b) Choose the best
explanation from among the following:
I. Its speed increases because the ray is now propagating in a
medium with a smaller index of refraction.
II. The speed decreases because the
whenever light moves from one medium to another.
III. The speed will stay the same because the speed of light is a
universal constant.
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