Geometrical Optics Chapter 2 Flashcards
Light
What are the laws of reflection?
- The angle of incidence is equal to the angle of reflection. i=r
- The incidence ray, The normal, and the reflected ray are all on the same plane.
Explain Parallax
Parallax is the apparent relative movement of an object due to the movement of the observer.
Explain Real image
A real image is formed by the actual intersection of light rays, always inverted an can be shown on a screen.
Explain Virtual image
Formed by the apparent intersection of light rays, always erect and cannot be shown on a screen.
What does a plane mirror do to an image
Makes it laterally inverted, same size image that as far away from the mirror as the actual object is.
Explain light and give it’s speed in air
Light is a form of energy that travels away from the source producing it at a speed of about 3 x {10^8}m/s
Explain self-luminous
Objects that give out their own light
Explain non-luminous
Objects that do not give out their own light but light from other sources bounce off it into your eye to see them.
How does light travel
Light travels in straight line ex: in path of light dust and moisture int he air show up.
What is a straight line of light called
ray
Explain diverging beams of light
out from a point (v)
Explain converging beams of light
in towards a point (cone)
What is reflection
Bouncing of light off an object
Explain regular reflection
Bouncing of light off a smooth, silvered and polished surface called a mirror.
Explain diffuse reflection
Bouncing of light from a rough surface that scatters in all different directions
Describe where an image is formed in a plane mirror and what sort of image it is
A virtual image formed in a plane mirror is on the perpendicular from the object to the mirror (straight across) and the same distance behind the mirror as the object is in front. Image is always laterally inverted and the same size
What does no parallax between two objects mean
The are in the same line and the same distance from the observer
Give three uses of plane mirrors
overhead projector
to see oneself
periscope