lecture 6 100909 - Optics: Reflection, Refraction...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Optics: Reflection, Refraction 05/25/2006 Lecture 16 n 1 = 1.5 n 2 = 1.0 Reflections and Refractive Offset • Let’s consider a thick piece of glass ( n = 1.5), and the light paths associated with it – reflection fraction = R = [(n 1 – n 2 )/(n 1 + n 2 )] 2 – using n 1 = 1.5, n 2 = 1.0 (air), R = (0.5/2.5) 2 = 0.04 = 4% incoming ray (100%) 96% 92% transmitted 0.16% 4% 4% 8% reflected in two image looks displaced due to jog Applications of Optics Curved lenses refract as flat interfaces, using local surface normal A lens, with front and back curved surfaces, bends light twice, each diverting incoming ray towards centerline. Follows laws of refraction at each surface. Parallel rays, coming, for instance from a specific direction (like a distant bird) are focused by a convex (positive) lens to a focal point. Placing film at this point would record an image of the distant bird at a very specific spot on the film. Lenses map incoming angles into positions in the focal plane. Cameras In a pinhole camera, the hole is so small that light hitting any particular point on the film plane must have come from a particular direction
Background image of page 1

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

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This document was uploaded on 05/29/2011.

Page1 / 2

lecture 6 100909 - Optics: Reflection, Refraction...

This preview shows document pages 1 - 2. Sign up to view the full document.

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