Reflection Lesson 3
Section A
1. Two type of curved mirrors
a. Convex- curved outwards
b. Concave- curved inwards
2. Aspects
a. Principal axis- line straight down the middle
b. Center of Curvature- point in the center of the sphere from which the mirror was sliced
c. Vertex- where the principal axis meets the mirror
d. Focal point- midway between the center of curvature and the vertex, the point in at which light incident towards the mirror and traveling parallel to the principal axis will meet after reflection
Section B
1. Light always follows the law of reflection
2. Only concave mirrors can form real images, the rest only can form virtual images
3. When all of the rays being reflected converge at one point, a reproduction forms. This reproduction is known as an image.
4. The viewer must line up exactly with the image in order to see the image (line of sight)
Section C
There are two rules for reflection for concave mirrors
1. Any incident ray traveling parallel to the principal axis on the way to the mirror will pass through the focal point upon reflection.
2. Any incident ray passing through the focal point on the way to the mirror will travel parallel to the principal axis upon reflection.
These rules help with determining image size
Section D
How to draw a ray diagram
1. Draw two rays from the top of the object, one going horizontally and one going diagonally (through the focal point). They should go from the image to the center of curvature. Use a straight edge
2. Draw two rays bouncing back through the focal point. The horizontal ray should now go diagonally through the focal point.
3. Locate where the rays intersect. This is where your image will be
4. Draw an upwards-facing arrow from the point at which the rays intersect to the horizontal axis. This is your image.
Section E
1. Object is beyond center of curvature
a. Real, inverted (upside down), reduced (smaller)
2. Object is located @ C
a. Real, inverted, same size
3. Object is between C and focal point
a. Real, inverted, magnified (larger)
4. Object located @ focal point
a. No image
5. Object located in front of focal point
a. Real, upright, magnified
Section F
1. Mirror equation- 1/f = 1/do + 1/di
a. f= focal point
b. do= distance of object
c. di= distance of image
2. Magnification equation-M= hi/ho = -di/do
a. M- magnification
b. hi= height of image
c. ho- height of object
3. These equations can be used to find info about image distance and image height
1. Two type of curved mirrors
a. Convex- curved outwards
b. Concave- curved inwards
2. Aspects
a. Principal axis- line straight down the middle
b. Center of Curvature- point in the center of the sphere from which the mirror was sliced
c. Vertex- where the principal axis meets the mirror
d. Focal point- midway between the center of curvature and the vertex, the point in at which light incident towards the mirror and traveling parallel to the principal axis will meet after reflection
Section B
1. Light always follows the law of reflection
2. Only concave mirrors can form real images, the rest only can form virtual images
3. When all of the rays being reflected converge at one point, a reproduction forms. This reproduction is known as an image.
4. The viewer must line up exactly with the image in order to see the image (line of sight)
Section C
There are two rules for reflection for concave mirrors
1. Any incident ray traveling parallel to the principal axis on the way to the mirror will pass through the focal point upon reflection.
2. Any incident ray passing through the focal point on the way to the mirror will travel parallel to the principal axis upon reflection.
These rules help with determining image size
Section D
How to draw a ray diagram
1. Draw two rays from the top of the object, one going horizontally and one going diagonally (through the focal point). They should go from the image to the center of curvature. Use a straight edge
2. Draw two rays bouncing back through the focal point. The horizontal ray should now go diagonally through the focal point.
3. Locate where the rays intersect. This is where your image will be
4. Draw an upwards-facing arrow from the point at which the rays intersect to the horizontal axis. This is your image.
Section E
1. Object is beyond center of curvature
a. Real, inverted (upside down), reduced (smaller)
2. Object is located @ C
a. Real, inverted, same size
3. Object is between C and focal point
a. Real, inverted, magnified (larger)
4. Object located @ focal point
a. No image
5. Object located in front of focal point
a. Real, upright, magnified
Section F
1. Mirror equation- 1/f = 1/do + 1/di
a. f= focal point
b. do= distance of object
c. di= distance of image
2. Magnification equation-M= hi/ho = -di/do
a. M- magnification
b. hi= height of image
c. ho- height of object
3. These equations can be used to find info about image distance and image height