71. A light ray enters a rectangular block of plastic at an angle & 1 ! 45.0° and emerges at an angle & 2 ! 76.0°, as shown in Figure P35.71. (a) Determine the index of refraction of the plastic. (b) If the light ray enters the plastic at a point L ! 50.0 cm from the bottom edge, how long does it take the light ray to travel through the plastic?
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.
71. A light ray enters a rectangular block of plastic at an angle
& 1 ! 45.0° and emerges at an angle & 2 ! 76.0°, as shown
in Figure P35.71. (a) Determine the index of refraction of
the plastic. (b) If the light ray enters the plastic at a point
L ! 50.0 cm from the bottom edge, how long does it take
the light ray to travel through the plastic?
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