Exam Revision - Light and Shadows Flashcards
As the object is moved closer to the light source the size of the shadow ________
Increases
A point source produces a shadow called the
Umbra
Description of the Umbra
Sharp edge and is uniformly dark
An extended source produces what two shadows
Umbra and Penumbra
Description of Penumbra
Blurry edge and is not uniformly dark because some light reaches it
An ordinary mirror is made by
putting a thin layer of silver on one side of a piece of glass
How is the silver protected in a mirror
Putting a layer of paint on the back
A flat mirror is called
A plane mirror
What is a mirror used for
To reflect light and change the direction in which it is travelling
The normal to the mirror is what
A line drawn at 90 degress to the mirror
The ray travelling in to the mirror is called
The incident ray
The angle between the incident ray and the normal is called
The angle of incidence
The angle of incidence is often represented by the letter
i
The ray reflecting off the mirror is called the what
The reflected ray
The angle between the reflected ray and the normal is called
The angle of reflection
