# Electromagnetic Waves - Y11 SACE

Flashcards by Ben Goetze, updated more than 1 year ago
 Created by Ben Goetze over 6 years ago
12
1

### Description

12 Science (Physics) Flashcards on Electromagnetic Waves - Y11 SACE, created by Ben Goetze on 11/22/2014.

## Resource summary

 Question Answer Electromagnetic Spectrum The full range of wavelengths of all electromagnetic waves: radio waves, microwaves, infra-red, visible light, ultraviolet, X-ray, Gamma rays. They are transverse waves made up of oscillating electric and magnetic fields that travel at the speed of light in a vacuum. (My way of remembering the order is: Riots Might Involve Violent Uprisings, with formation X-ray-Gamma) The Normal The line which is perpendicular to the reflecting surface at the point where the ray hits it Angles are measured from the _________ Normal Law of Reflection The angle of incidence is equal to the angle of reflection and the incident ray, reflected ray and normal lie on the same plane Images only occur on _______________ Flat Surfaces The focus of a Curved Mirror Where all the rays from a converging (concave) mirror are concentrated, or where they appear to originate after passing through a diverging (convex) mirror Refraction Refraction is the bending of light, when it his the interface between the 2 media obliquely, as it passes from one medium or depth to another Refraction is caused by: The change of speed of the waves in the different medium. Refraction towards the normal indicates that the light is slowing down, whilst refraction away from the normal indicates that the light is speeding up Refractive Index The ratio of the speed of light in a vacuum to the speed of light in the medium Snell's Law Angle of incidence is directly proportional to the sine of the angle of refraction for a particular pair of media Total Internal Reflection The critical angle where total internal reflection prevents the ray from escaping from a higher optical-density medium to a lower optical-density medium. (The angle of refraction that corresponds to the critical angle is 90 degrees) Total internal reflection can be used to: Transmit signals down optical fibres

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