15.1 Cameras

# 15.1 Cameras - 7/31/2008 1 Key Concepts: 1. Lenses 2....

This preview shows pages 1–3. Sign up to view the full content.

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.

Unformatted text preview: 7/31/2008 1 Key Concepts: 1. Lenses 2. Images 3. Film Observations About Cameras ¡ They record the light from a scene on a film or sensor ¡ Good cameras have to focus, cheap ones don¢t ¡ They sometimes have zoom lenses ¡ Some cameras have bigger lenses than others ¡ Cameras have ratings like focal length and f- number SHADOWS Regions not completely visible by the light sources Light Source Object Shadow PINHOLE CAMERAS Object Image Pinhole ¡ What affects focus? ¡ What affects size of image? Light from an Object ¡ An illuminated object reflects or scatters light ¡ You see object via this reflected or scattered light ¡ The object¢s light forms diffuse illumination ¡ You can¢t form an image on a screen from this diffuse illumination Lenses Use Refraction Curved lenses follow the same rules as flat interfaces, using local surface normal Lens A lens bends light twice Follows laws of refraction at each surface. Close-up 7/31/2008 2 A camera uses a? A. converging lens to form a real image. B. converging lens to form an imaginary image. C. diverging lens to form a real image. D. diverging lens to form an imaginary image. Clicker Question 1 Converging Lenses ¡ A converging lens uses refraction to bend light rays ¡ Light rays converge after passing a converging lens ¡ Rays from a common point on an object converge to a common point on far side of the converging lens Lenses Double Convex Lens Double Concave Lens Converging Lens Diverging Lens Concave Lens Convex Lens Light is Converging Light is Diverging F F¡ C f Terminology of Convex Lens F: Focus f = focal length C: Optical Center Principal axis Let¢s get focused£ ¡ Parallel rays from a specific direction are focused by a convex lens to a focal point....
View Full Document

## This note was uploaded on 02/07/2010 for the course PHY 1405 taught by Professor Russell during the Fall '07 term at Baylor.

### Page1 / 7

15.1 Cameras - 7/31/2008 1 Key Concepts: 1. Lenses 2....

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online