Lesson 4
Section A
1. Anatomy of Convex Mirrors
a. Pointed outwards, like an eyeball, also known as diverging
b. Focal point along horizontal axis
c. Focal point behind mirror (negative focal length
2. Only produce virtual images because after the rays diverge after reflecting
3. Virtual images- light does not actually pass through image location, only appears to
4. Revised rules from last section
a. Any incident ray traveling parallel to the principal axis on the way to a convex mirror will reflect in such a manner that its extension will pass through the focal point.
b. Any incident ray traveling towards a convex mirror such that its extension passes through the focal point will reflect and travel parallel to the principal axis.
Section B:
How to draw a ray diagram
1. Draw two rays, one horizontal and one diagonal, from the top of the object to the mirror
2. Draw two reflected rays. The horizontal ray should reflect vertically, and the vertical ray should reflect horizontally
3. Continue the reflected rays through the mirror to the focal point. Make the lines dashed to indicate that they are not real.
4. Find where the lines intersect. Draw an upwards facing arrow from this point to the horizontal axis. This is your image
Section C
Images produced by convex mirrors are always
1. Virtual
2. Upright
3. Reduced
Again, no matter the circumstances, these are always the characteristics of images produced by convex mirrors
Section D
1. Mirror equation: 1/f = 1/do + 1/di
2. Magnification equation: M= hi/ho = -di/do
1. Anatomy of Convex Mirrors
a. Pointed outwards, like an eyeball, also known as diverging
b. Focal point along horizontal axis
c. Focal point behind mirror (negative focal length
2. Only produce virtual images because after the rays diverge after reflecting
3. Virtual images- light does not actually pass through image location, only appears to
4. Revised rules from last section
a. Any incident ray traveling parallel to the principal axis on the way to a convex mirror will reflect in such a manner that its extension will pass through the focal point.
b. Any incident ray traveling towards a convex mirror such that its extension passes through the focal point will reflect and travel parallel to the principal axis.
Section B:
How to draw a ray diagram
1. Draw two rays, one horizontal and one diagonal, from the top of the object to the mirror
2. Draw two reflected rays. The horizontal ray should reflect vertically, and the vertical ray should reflect horizontally
3. Continue the reflected rays through the mirror to the focal point. Make the lines dashed to indicate that they are not real.
4. Find where the lines intersect. Draw an upwards facing arrow from this point to the horizontal axis. This is your image
Section C
Images produced by convex mirrors are always
1. Virtual
2. Upright
3. Reduced
Again, no matter the circumstances, these are always the characteristics of images produced by convex mirrors
Section D
1. Mirror equation: 1/f = 1/do + 1/di
2. Magnification equation: M= hi/ho = -di/do