Light. November 101 Lect 11 1
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1 Light What is light? To start, what are the observed properties of light? Describe the intrinsic properties of light light by itself. Later, what are the interactions of light? What happens when light meets matter? November 101 Lect 11 1
2 Intensity, or brightness COLOR Properties of light Speed (fast!) Direction of motion Polarization The speed of light is different in different materials. Light does not always travel in straight lines. first observed in the birefringence of calcite; discussed by Huygens and Newton. November 101 Lect 11 2
3 Light moves! an opaque object casts a shadow. November 101 Lect 11 3
4 If light moves, how fast is it? Galileo tried to measure the speed of light using signals from lanterns on two mountains. He was unsuccessful light is too fast! The first measurement of the speed of light was astronomical, made by Roemer in 1676 using the eclipses of the moons of Jupiter (which had been discovered by Galileo in 1610). c=2.998 x 10 8 m/s Use this number in the capa problems. 300,000 kilometers in one second November 101 Lect 11 4
5 To explain the properties of light, we need a theory. Question from history: Is light composed of particles or waves? Christian Huygens ( ) developed a wave theory of light. Isaac Newton ( ) believed that light is a stream of particles. Quantum theory (20 th century) says that light has both wave and particle aspects. Seems self-contradictory! November 101 Lect 11 5
6 But that still doesn t answer the question. What is light? What is light made of? Answer: Light is an electromagnetic phenomenon. Light is made of electric and magnetic fields. November 101 Lect 11 6
7 James Clerk Maxwell the second great theoretical physicist in the history of science (after Newton). Maxwell s equations E / 0 and B 0 B E E and B o j 0 0 t t Faraday Ampere Maxwell These four equations describe all electromagnetic phenomena, if you know how to interpret them. November 101 Lect 11 7
8 Maxwell noted that the field equations can be satisfied by electromagnetic waves... The electric and magnetic fields go together, in a fixed ratio. Propagation in the direction of ExB and the wave speed is c m/s 8 use the measured values November 101 Lect 11 8
9 Maxwell s field theory of light Maxwell s equations have certain implications: E and B are transverse and orthogonal. The relation of field strengths is B = E/c. The speed of light is c = 1/ 0 0, independent of wavelength, in vacuum. November 101 Lect 11 9
10 Wavelength, frequency, and wave speed f c That holds for all harmonic waves; simply, distance time speed November 101 Lect 11 10
11 Intensity, or brightness COLOR Properties of light Speed (fast!) Direction of motion Polarization The speed of light is different in different materials. Light does not always travel in straight lines. observed in birefringence of calcite; discussed by Huygens and Newton. November 101 Lect 11 11
12 Intensity, or brightness direction propagatio of n is E B E 0 = amplitude of electric field oscillations B 0 = amplitude of magnetic field oscillations B 0 = E 0 /c where c 2 = 1/ 0 0 energy flux radiant power area c E November 101 Lect 11 12
13 Example: The intensity decreases with distance as 1/r 2 for a point-like source. Reason: Conservation of energy. I( r) P A where A 4 r 2 defining intensity as energy flux November 101 Lect 11 13
14 The electromagnetic spectrum Electromagnetic waves exist with any wavelength. What is so special about visible light? Sunlight is a superposition (mixture) of wavelengths with largest intensity from 400 to 700 nm - because the sun is a blackbody radiator at about 5800 K. Evolution Theory: Our eyes evolved to perceive these wavelengths. Creationism: God made our eyes to see these wavelengths. November 101 Lect 11 14
15 Polarization of light The electric and magnetic fields are vectors. The electromagnetic wave is transverse; i.e., E and B are perpendicular to the direction of propagation. For a given direction of propagation k, E must be in a plane perpendicular to k. For polarized light, the electric field oscillates in only one direction in the transverse plane. November 101 Lect 11 15
16 Why do fishermen wear polarized sunglasses? Sunlight reflects from the water surface. The reflected waves are significantly polarized, having stronger horizontal vibrations of E than vertical. The sunglasses are designed to absorb the horizontal vibrations. November 101 Lect 11 16
17 Velocity of light (speed and direction) Electromagnetic waves in vacuum Imagine this wave moving to the right. As the magnetic field changes there is an induced electric field (Faraday). As the electric field changes there is an induced magnetic field (Maxwell). The wave propagates as a whole. Electromagnetic waves in a dielectric (air, water, glass, etc) The fields polarize the atoms (mainly electric polarization and a little bit of magnetic polarization) and the polarized atoms modify the fields. So, the wave propagates at a slower speed. November 101 Lect 11 17
18 REFLECTION AND REFRACTION November 101 Lect 11 18
19 Reflection and refraction These materials are dielectrics. Define index of refraction n by n = c/v. Law of reflection: equal angles Law of refraction (Snell): n 1 sin 1 n2 sin 2 November 101 Lect 11 19
20 Mirror images obs. virtual image When you look at an object in an ideal mirror, the image is the same as if a copy were facing you from an equal distance behind the mirror. November 101 Lect 11 20
21 Reflection The Law of Equal Angles November 101 Lect 11 22
22 Refraction: The wave slows down so it changes direction. n = c/v n1 sin 1 n2 sin November 101 Lect
23 Why does it look bent? November 101 Lect 11 24
24 Refraction and reflection of sunlight at a beach in Lake Huron November 101 Lect 11 26
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