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Physics

Reflection & Refraction

QuestionAnswer
Self-Luminous object one that gives out it's own light
Non-luminous object one that does not give out it's own light
Light Light is a form of energy that travels away from the source producing it at a speed of about 3x10 ( to the power of 8) m/s
Diverging beam A beam of light which spreads out from the source
Converging beam A beam of light which gets narrower as it travels away from the source
Parallel beam A beam of light which remains the same width as it travels away from the source
Light Ray A straight line showing the direction in which light is traveling
Reflection of Light The rebounding of light off an object
Diffuse reflection when a surface in which light shines is rough, the reflected light scatters in all directions from the surface
Regular Reflection When a surface in which light shines is silvered and polished smooth the light reflected off of it is not scattered in all directions and the reflected rays remain parallel
Incident ray The ray of light falling on the surface
Normal at the point of incidence The line drawn perpendicular to the surface where the ray strikes the surface
Reflected ray The ray of light leaving the surface
Laws of reflection 1. The incident ray, the normal at the point of incidence and the reflected ray all lie on the same plane 2. The angle of incidence is equal to the angle of reflection
Virtual Image Is formed by the apparent intersections of rays
Lateral Inversion is the reversal of an object's left and right sides when viewed in mirror
Parrallax Is the apparent movement of one object to another due to the movement of the observer. The object that is further away appears to move with the observer
Magnification The ratio of the height of the image to the height of the object
Refraction The bending of a ray of light when it goes from one medium to another
Laws of refraction 1.. The incident ray, the normal at the point of incidence and the reflected ray all lie on the same plane 2. the ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant
Snell's Law the refractive index of a medium is the ratio of the sine of the angle of incidence to the sine of the angle of refraction when light travels from a vacuum into that medium
The Critical angle is the angle of incidence in the denser medium for which the angle of refraction in the less dense medium is 90 degrees
Total Internal Refraction Occurs when the angle of incidence in the denser medium exceeds the critical angle and light is reflected back into the denser medium
Optical fibre a very thin transparent rod (usually of glass0 through which light can travel by total internal refraction. The refractive index of the coating is less dense than the optical fibre.
Primary colors of light Red, Green, Blue
One advantage and one disadvantage of using a convex mirror in car wing mirror over plane mirror wide range of view image diminished
Created by: user-1973937
 

 



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