Chapter 2/3 Geometrical Optics and Reflection of Light
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19 Terms
What is reflection
The bouncing of light off a surface
Laws of reflection of light
Law 1 : The incident ray, normal at point of incidence and reflected Ray all lie in same plane.
Law 2 : The angle of incidence is equal to the angle of reflection.
Define virtual image
A virtual image is an image formed by the apparent intersection of rays. (Cannot be formed on screen)
Define real image
A real image is an image formed on a screen by the actual intersection of rays
Draw a labelled diagram of a Real Image Diminished on a concave screen
Draw a labelled diagram of a Real Image Same Size on a concave screen
Real image magnified
Draw a labelled diagram of a Real Image Magnified on a concave screen
Real image same size
Draw a labelled diagram of a Virtual Image Magnified on a concave screen
image at infinity
Draw a labelled diagram of a Virtual Image At Infinity on a concave screen
virtual image magnified
formula for a concave mirror
1/u + 1/v = 1/f
formula for magnification
Magnification = image size / real size
m=v/u
What is always produced in a convex mirror?
Virtual upright image (also diminished)
Real life application of a convex mirror
wing mirrors on a car
Labelled diagram for the measurement of the focal length of a concave mirror
Describe how the student found an approximation value for the focal length
Focus the image of a distant object on a screen and measure the distance from the screen to the mirror
Why did the student find an approximation for the focal length?
Object must be outside the focal length for a real image to be produced
Describe how the student measured v
move the object until the sharpest image is formed on the screen and then measure the distance to the screen with a metre stick
what is meant by the focal length?
the distance between the center of a lens/concave mirror and its focal point/focus
Sources of Error/Precautions
Take all measurements from the back of the mirror
Determining the image in its sharpest position
Parallax Error