Approximate wavelengths for red and violet light
Red: 750nm
Violet: 400nm
Rotating mirrors experiment formula and letter meanings
v=2dnf
v=calculated speed of light (m/s)
d=distance between mirrors (m)
n=# of sides
f=rotations per second (Hz)
Which way is light refracted when it moves from a low to high index?
Bends towards normal
What is the relation of indexes when light is refracted from one to the other if light bends away from normal?
High to low index
Which mirror and which lens have a real focal point?
Concave mirror )
Converging lens ()
Which mirror and which lens have a virtual focal point?
Convex mirror (
Diverging lens )(
Ray diagrams for mirrors
- A ray parallel to principal axis is reflected towards(concave)/away from(convex) focal point
- A ray going through(concave)/toward(convex) the focal point will be reflected parallel to the principal axis
Ray diagrams for lenses
- A ray parallel to the principal axis will be refracted toward(converging)/away from(diverging) focal point
- A ray going through c (centre of lens) will continue along its path without deviating
Sign convention for concave mirrors or converging lenses
+f
Sign convention for convex mirrors or diverging lenses
-f
Sign convention for virtual upright images
-di
+h
+M
Sign convention for real inverted images
+di
-hi
-M
What are the characteristics of the image produced by convex mirrors and diverging lenses?
Smaller
Upright/virtual
What are the characteristics of the image produced by a concave mirror or diverging lens when do<f?
Larger
Upright/virtual
What are the characteristics of the image produced by a concave mirror or diverging lens when f<do<2f?
Larger
Inverted/real
What are the characteristics of the image produced by a concave mirror or diverging lens when do>2f?
Smaller
Inverted/real
When is the image produced by a concave mirror or converging lens larger than the object?
When do<2f
When is the image produced by a concave mirror or converging lens inverted/virtual?
When do>f
When is the image produced by a concave mirror or converging lens smaller than the object?
When do>2f
When is the image produced by a concave mirror or converging lens upright/real?
When do<f
What did Thomas young do? (3 things)
Double slit experiment
Verified wave theory
First to calculate wavelength of light
