Chapter 18 v Geometrical Optics: Ray of light v Reflection and Refraction v Total Internal Reflection v Chromatic Dispersion of light v Image formation due to reflection in mirrors v Thin lenses and image formation due to thin lenses Geometrical (Ray) Optics Optical fiber Lens Dr. Amir Maharjan
2 These thin beams of light at this laser show are well described using ray optics. How do these light beams behave when they reflect from shiny surfaces or pass through transparent materials?Light travels as a ray - a geometrical path of the light
Although light waves spread as they move from a source, often we can approximate its travel as being a straight line geometrical optics Reflection and Refraction What happens when a narrow beam of light encounters a glass surface? Reflection applet: Law of Reflection: 1. Angle of incidence = angle of reflection θi = θr. . All these angles are measured relative to the normal drawn at the interface. 2. The incident ray, reflected ray and normal all lie in the same plane.
4 Laws of reflection explanation Even a rough surface obeys laws of reflection.
2 q 1
9 9 Apparent depth Real depth Real and apparent depth (consequences of refraction of light)
10 vFigure below shows a fish and a fish stalker in water. (a) Does the stalker see the fish in the general region of point aor point b(b) Does the fish see the eyes of the stalker in the general region of point cor point d ? ?
You've reached the end of your free preview.
Want to read all 63 pages?
- Spring '13
- Total internal reflection, Geometrical optics