Ch 12 Light# Flashcards
Define reflection.
Reflection is the bouncing of light off a surface.
The ray of light that hits the mirror surface is known as the _____ ray.
Incident Ray
The ray of light that bounces off the mirror surface is known as the _____ ray.
Reflected Ray
The imaginary line perpendicular to the mirror surface at the point of incidence is known as the _____.
Normal
The angle between the incident ray and the normal is known as the angle of _____.
Incidence, i
The angle between the reflected ray and the normal is known as the angle of _____.
Reflection, r
What are the characteristics of an image formed are observed when light rays are reflected off a plane mirror?
- Same Size
- Laterally Inverted
- Upright
- Virtual
- Distance between the image and the mirror = Distance between the object and the mirror
The image formed in the mirror is virtual. What does the term ‘virtual’ means?
It means that the image cannot be formed on the screen.
Define refraction.
Refraction is the bending of a light ray as it travels from one optical medium to another.
What is the Snell’s Law? (also known as formula for refractive index, n)
sin i / sin r = constant
i = angle of incidence
r= angle of refraction
Formula for Refractive Index. (using speed of light)
n = c / v n = medium c = speed of light in vacuum v = speed of light in medium
What does a thin converging lens does to a beam of light?
It converges the light rays to a single point.
State the properties of the image formed by the lens when the object is placed very far away from the lens.
There are 3 properties
- inverted
- real
- diminished
State the properties of the image formed by the lens when the object is placed slightly further than 2f.
There are 3 properties
- inverted
- real
- diminished
State the properties of the image formed by the lens when the object is placed at 2f.
There are 3 properties
- inverted
- real
- same size
State the properties of the image formed by the lens when the object is placed between f and 2f.
There are 3 properties
- inverted
- real
- magnified
State the properties of the image formed by the lens when the object is placed at f.
There are 3 properties
- upright
- virtual
- magnified
State the properties of the image formed by the lens when the object is placed between the optical center and f.
There are 3 properties
- upright
- virtual
- magnified
