Key Terms Chapter 10 - Light And Reflection Flashcards
Incandescence
Light emitted from a material because of the high temperature of the material
Fluorescence
Light that is emitted due to the exposure of the source to UV light
Luminescence
Emission of light by a material that has not been heated
Phosphorescence
Light that is emitted due to the exposure of the source to UV light, excited atoms retain energy and light is emitted for prolonged periods of time
Chemiluminescence
Light that is produced by a chemical reaction, no ride in temperature
Bioluminescence
Light that is produced due to a biochemical reaction in a living organism
Wavelength
Distance from one crest/trough of a wave to the next
Reflection
The change in direction of a light ray when it bounces off a surface
Medium
The substance through which light travels
Ray
A straight line with arrowhead that shows which way light waves are travelling
Incident Ray
A ray of light that travels from a light source to an object
Angle of incidence
The angle between the incident ray and the normal in a ray diagram
Normal
A line that is perpendicular to a surface where a Ray of light meets the surface
Reflected ray
Begins at the point where the incident Ray and normal meet
Angle of reflection
Between reflected Ray and normal in Ray diagram
Plane mirror
A mirror with a flat, reflective surface
Virtual image
Image formed by rays that appear to be coming from a certain position, but are not, image does not perform a visible projection on a screen
Concave mirror
Mirror whose reflecting surface curves inward
Principle axis
On a concave mirror, the line that passes through the centre of curvature of the mirror and is normal to centre of mirror
Focal point
Point on principle axis through which reflected rays pass when incident rays are parallel to and near the principle axis
Focal length
Distance between vertex of a mirror and the focal point
Real image
An image formed when reflected rays meet
Magnification
Change in size of an optically produced image
Spherical aberration
Irregularities in an image in a curved mirror that result when reflected rays from the outer parts of the mirror do not go through the focal point
Convex mirror
Mirror reflecting surfaces curves outward
