lecture 6 100909

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

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

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

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

View Full Document
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
Ask a homework question - tutors are online