Physics Test #2 Flashcards
Reflection
When a ray of light hits a smooth surface and bounces back
Refraction
The bending of light when it passes from one medium to another
Total internal reflection
Light being reflected in a medium when the angle is steep enough to stop it from going into the second medium
Mirage/shimmer/dispersion
Mirage: light travelling from cool into warmer air bends away from the normal
Shimmer: refraction of light in unevenly heated air
Dispersion: refraction of white light into separate wavelengths or colours
Components of the eye
-cornea
-iris
-lens
-pupil
-retina
-optic nerve
-anterior chamber
Difference between refraction and total internal reflection
Refraction: the bending of light when it passes from one medium to another
TIR: light reflected in a medium when the angle is steep enough to stop it from going into the second medium
Equations
Snells law: n1sinθ1= n2sinθ2
Magnification: m=di/do
Frequency: cycles/sec x #cm
Thin lens: 1/f = 1/do + 1/di
Index of refraction: n = c/v
Explain the uses of concave and convex lenses
Concave: vehicle headlights, flashlights
Convex: rear/side view mirrors, security mirrors
Glasses - optical technology
-specially shaped lenses to focus light properly onto your eyes
-bend light in a way that helps you see clearly
-helps image to focus directly on your retina
Ray/angle of incidence
Ray of light coming towards a surface
Angle between the incident ray and the normal
Ray/angle of reflection
Ray of light that bounces off a surface, begins where the incident and normal meet
Angle between the normal and the reflected ray
Ray/angle of refraction
The ray that enters the second medium and either bends away or towards the line, depending on how strong
Angle between the refracted ray and the normal
Astigmatism
Irregular shape of the cornea or lens that prevents a clear image to form on the retina
ROYGBIV. Most energy?
Violet
Reflecting telescope - optical technology
-light enters from one end of the tube -reflects off of a concave mirror toward a small plane mirror
-directs the light into the eyepiece
