1. Light originating in a material (n = 1.5) strikes a boundary with a material of index n1 = 1.2 at an angle of incidence of 25o. The second material is changed to one with an index of n2 = 1.4 instead, with the ray still originating in the material with n = 1.5, hitting at the same angle of incidence, 25o . Which reflection will have the largest angle of reflection, n1 or n2? A. ray reflecting from material n1 B. ray reflecting from material n2 C. rays reflect at the same angle for both materials D. this will depend on the values of n1 and n2. 2. Light traveling in a vacuum (n1 = 1) encounters a boundary with a material of index n2 = 1.5. If the light strikes the boundary at an angle of incidence of 30o, what is the angle of refraction (in degrees)? 3. Light hits a smooth surface at an angle of 60o from the normal. At what angle (from the normal) does the reflected light come off the surface? A. 15o B. 30o C. 60o D. Light is refracted at a surface, not reflected
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.
1.
Light originating in a material (n = 1.5) strikes a boundary with a material of index n1 = 1.2 at an angle of incidence of 25o. The second material is changed to one with an index of n2 = 1.4 instead, with the ray still originating in the material with n = 1.5, hitting at the same angle of incidence, 25o . Which reflection will have the largest angle of reflection, n1 or n2?
A.
ray reflecting from material n1
B.
ray reflecting from material n2
C.
rays reflect at the same angle for both materials
D.
this will depend on the values of n1 and n2.
2. Light traveling in a vacuum (n1 = 1) encounters a boundary with a material of index n2 = 1.5. If the light strikes the boundary at an angle of incidence of 30o, what is the angle of refraction (in degrees)?
3. Light hits a smooth surface at an angle of 60o from the normal. At what angle (from the normal) does the reflected light come off the surface?
A.
15o
B.
30o
C.
60o
D.
Light is refracted at a surface, not reflected
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