Gr.11 T3 Physics Flashcards
What is interference?
The effect of superposition of waves of the same kind
What is diffraction of waves?
The ability of waves to spread out in wavefronts as they pass through a small opening or around the edge of a barrier.
What is a wavefront?
An imaginary line that connects waves that are in phase
Why is light said to have dual nature?
It has wave nature and particle nature
What does “w” represent?
Width of the opening through which light shines and diffracts
Degree of diffraction is ________ proportional to wavelength
Directly
Degree of diffraction is ________ proportional to width of the opening
Inversely
Optical medium
Any material through which light can travel
Reflection of light
Light strikes a boundary surface through which it cannot move and it bounces back into the same optical medium
Law of reflection
When light is reflected, the angle of incidence is always equal to the angle of reflection
Optical density
An indication of the ease with which light travels through an optical medium.
Refraction of light
A change in the direction of a light Ray as it moves from one optical medium to another with a different optical density
What happens at the boundary between two media
Light bends
Speed of light changes
Refractive index
The ratio of the speed of light in a vacuum to the speed of light in any other medium
Less dense to more dense medium, light moves _____ the normal
Towards
