PHYS 123 EXAM 2 QUESTIONS AND COMPLETE
ANSWERS 100% PASS
Ray - ANSWER a line that represents the direction in which light travels. a beam of light with a
very small cross-sectional area approximately corresponds to a ray
Transmitted light - ANSWER light rays that passes through the material
Absorbed light - ANSWER light that enters a material but never exits again
Reflected light - ANSWER any light that is redirected away from the surface of the material
Image - ANSWER what is formed when rays that come from an object and are reflected from
a smooth surface
Ray Diagram - ANSWER a diagram that shows a few selected rays
Diffuse Reflection - ANSWER when a surface is rough and the rays are reflected in random
directions. there is no image formed
Specular Reflection - ANSWER A symmetric reflection off of a smooth surface where an image
is formed and the angle of incidence is equal to that of reflection
, When a light ray travels from a slower medium to a faster medium... - ANSWER the ray bends
TOWARD the normal to the interface between the materials
Refraction - ANSWER The bending of light as it goes from one material to another
Dispersion - ANSWER The observation that the speed of light in a medium varies with the
frequency of the light
The relationship between the angle of incidence and angle of refraction is COMPLETELY
determined by... - ANSWER the speedof light (NOT the where the rays are coming from)
Total Internal Reflection - ANSWER The reflection of the total amount of incident light at the
boundary between the two media
The Conditions for TIR are... - ANSWER (1) the light is in traveling from the slower medium to
the faster medium
(2) the angle of incidence is greater than the critical angle
Focus - ANSWER The point where rays parallel to the lens axis of a converging lens intersect
Virtual Focus - ANSWER The point where rays parallel to the lens axis of a diverging lens
diverge appear to come from
ANSWERS 100% PASS
Ray - ANSWER a line that represents the direction in which light travels. a beam of light with a
very small cross-sectional area approximately corresponds to a ray
Transmitted light - ANSWER light rays that passes through the material
Absorbed light - ANSWER light that enters a material but never exits again
Reflected light - ANSWER any light that is redirected away from the surface of the material
Image - ANSWER what is formed when rays that come from an object and are reflected from
a smooth surface
Ray Diagram - ANSWER a diagram that shows a few selected rays
Diffuse Reflection - ANSWER when a surface is rough and the rays are reflected in random
directions. there is no image formed
Specular Reflection - ANSWER A symmetric reflection off of a smooth surface where an image
is formed and the angle of incidence is equal to that of reflection
, When a light ray travels from a slower medium to a faster medium... - ANSWER the ray bends
TOWARD the normal to the interface between the materials
Refraction - ANSWER The bending of light as it goes from one material to another
Dispersion - ANSWER The observation that the speed of light in a medium varies with the
frequency of the light
The relationship between the angle of incidence and angle of refraction is COMPLETELY
determined by... - ANSWER the speedof light (NOT the where the rays are coming from)
Total Internal Reflection - ANSWER The reflection of the total amount of incident light at the
boundary between the two media
The Conditions for TIR are... - ANSWER (1) the light is in traveling from the slower medium to
the faster medium
(2) the angle of incidence is greater than the critical angle
Focus - ANSWER The point where rays parallel to the lens axis of a converging lens intersect
Virtual Focus - ANSWER The point where rays parallel to the lens axis of a diverging lens
diverge appear to come from
