Light Flashcards
What is the ‘Law of Reflection’?
The angle of incidence is equal to the angle of reflection.
What is the incident ray?
The ray that falls on a surface.
What is the reflected ray?
The ray that bounces off the surface.
What is the ‘normal’?
The line t right-angles to the surface.
What is the angle of incidence?
The angle, i, between the incident ray and the normal.
What is the angle of reflection?
The angle, r, between the reflected ray and the normal.
What are the properties of an image formed in a plane mirror?
- It is the same size as the object.
- Same distance behind the mirror as the object in front.
- It is a virtual image.
- It is laterally inverted, but always inverted.
What is refraction?
The bending of light when it goes from one material to the next due to a change in speed in the different materials.
What is the refracted ray?
The ray after it has been bent.
What is the angle of refraction?
The angle, r, between the refracted ray and the normal.
In refraction, what can you say about the ray of light before it enters the Perspex box (INCIDENT RAY) and the ray after it leaves the block (EMERGENT RAY)?
They are parallel.
What two criteria makes things directly proportional on a graph?
-If it is a straight line
-If it passes through the origin
How could you improve a refraction of light experiment?
-Repeat the experiment
-Use a narrower slit to produce a narrower beam (more accurate)
-Tun off lights and close the blinds
Finish the sentence: When light enters a Perspex block, it bends…?
Towards the normal.
Finish the sentence: When light leaves a Perspex block, it bends…?
Away from the normal.
