zhang22 - 2/27/2010 Reflection and Refraction of Light And...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
2/27/2010 1 Reflection and Refraction of Light And God said, Let there be light : and there was light. 1000 AD: Light was believed to be tiny particles Newton: Explained reflection and refraction using particle model Huygens: Light is wave-like Young (Double slit experiment): Support of wave theory by showing interference Maxwell: Light is electromagnetic wave Planck/Einstein: Light has quantized energy, i.e, like particles (concept of photon ) Today: Dual nature of light; light is both particle and wave
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2/27/2010 2 Wave nature: EM wave; all properties of propagating “wave” “Particles” of light are called photons ; e ach photon has a particular energy Includes both natures of light: Interacts like a particle; has a certain frequency ( f ), wave! Experiments can be devised to display either the wave or the particle nature of light In some experiments light acts as a wave and in others it acts as a particle constant) s Planck' : s J 10 63 . 6 ( 34 h hf E The ray approximation is used to represent beams of light Light travels in a straight-line path in a homogeneous medium until it encounters a boundary between two different media Transparent materials: Light can propagate without significant attenuation Opaque materials: Light cannot propagate through
Background image of page 2
2/27/2010 3 When light encounters a boundary with a second medium, part of the incident ray is reflected back into the first medium Specular reflection: Reflection from a smooth surface; the reflected rays are parallel to each other (if the incident rays are parallel) Diffuse reflection: Reflection from a rough surface; the reflected rays travel in a variety of directions Specular reflection: Smooth and flat surface Diffuse reflection: rough surface
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2/27/2010 4 The normal is a line perpendicular to the surface The incident ray makes an angle of θ 1 with the normal The reflected ray makes an angle of θ 1 with the normal Law of Reflection: (some laws in physics can be “embarrassingly simple!) ' 1 1 Two reflections Goal: Find the reflection angle at the second mirror (a) (b) (c) (d) Finally ref o inc ref 65 o o ref 25 65 90 90 0 0 o o o o 35 25 120 180 120 180 0 o o o o inc 55 35 90 90 o inc ref 55
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/15/2010 for the course PHY 102 taught by Professor Luo during the Spring '08 term at SUNY Buffalo.

Page1 / 19

zhang22 - 2/27/2010 Reflection and Refraction of Light And...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online