Light Flashcards
What is a light source?
Something that emits light
How does light reach our eyes from a book?
It reflects from the page into our eye
A luminous object _____ light
gives out
Objects that transmit light are called…
transparent
Light does not travel through _______ materials
opaque
Light can travel through translucent materials but it is…
scattered
Non luminous object _______ light
reflects
How fast is the speed of light?
300,000km/s
Light can travel through an empty space which is called a…
vacuum
Light travels as a…
wave
The ray that hits the mirror is called…
the incident ray
The ray that reflects from the mirror is called…
the reflected ray
The imaginary 90 degree line line to the mirror is called…
The normal
The angle between the incident ray and the normal is called…
The angle of incidence
The angle between the normal and the reflection ray is called…
The angle of reflection
True or false, the angle if incidence is always equal to the angle of reflection
True
If the angle of incidence is 30 degrees, what is the angle of reflection?
30 degrees
Reflection on a smooth surface is called…
specular reflection
When light enters into glass or water, it _____ ____
Slows down
Reflection on a rough surface is called…
diffuse reflection
In each of our eyes, we have a _____ to focus on the incoming light
lens
When rays of light travel through a convex lens they are bent and cross at the…
focal point
The distance from the middle of the lens to the focal point is…
focal length
The size of the pupil is called the…
iris
