Optics_1_0212_handout

# Optics_1_0212_handou - Optics 1 This experiment has two parts 1 Ray Tracing 2 Study of a Converging Lens A wave front is a surface of constant

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

PHYS 0212 Optics 1 1 Optics 1 This experiment has two parts: 2. Study of a Converging Lens 1. Ray Tracing Light is a transverse, electromagnetic wave. Two light waves are in phase if their crests (or troughs) line up. PHYS 0212 Optics 1 2 A wave front is a surface of constant phase. The simplest example is a ripple spreading out on a pond. A ray is an arrow that is perpendicular to the wave front and pointing in the direction of travel. It is a common way to represent a wave front. The number of light rays is arbitrary, we can draw as many or as few as we like. Often we will only draw a few representative rays to trace light as it reflects from or refracts through objects. PHYS 0212 Optics 1 3 What happens when light encounters a boundary between two materials? Incident Ray Reflected Ray Transmitted Ray Part of the incident light gets reflected and the rest gets transmitted through the boundary. How much light gets reflected or transmitted depends on the material. Water and glass transmit most of the incident light and only reflect a small amount. So you can see through these materials and also see your reflection on the surface. Metals, like silver, do not transmit any of the incident light, it all gets reflected. If the surface of a metal object is polished it will act as a mirror. In fact, most mirrors are really just aluminum or silver painted onto the back of a glass sheet. Normal PHYS 0212 Optics 1 4 Let’s look at the reflected ray first. Law of Reflection The normal is a line perpendicular to the boundary at the point where the incident ray intersects it. The angle of incidence θ i equals the angle of reflection r . Both angles are measured with respect to the normal.

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 note was uploaded on 08/17/2008 for the course PHYS 0212 taught by Professor Naples during the Spring '08 term at Pittsburgh.

### Page1 / 5

Optics_1_0212_handou - Optics 1 This experiment has two parts 1 Ray Tracing 2 Study of a Converging Lens A wave front is a surface of constant

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

View Full Document
Ask a homework question - tutors are online