Experiment worksheet on concave-convex mirrors and
concave-convex lenses.
Learning objectives
1. To study the relationship between focal length, object distance,
image distance and image formation type of concave and convex
mirrors.
2. To study the relationship between focal length, object distance,
image distance and image formation type of concave and convex
lenses.
virtual experiment tool PhET simulations Simulation of geometrical optics.
https://phet.colorado.edu/th/simulations/geometric-optics
Figure 12.1 PhET Scenario Screen Simulation of geometrical optics.
1. Concave mirror
Distance(p)
140
160
180
200
220
(cm)
Image distance(q)
(cm)
1/p (m-1)
1/q (m-1)
Graph the relationship between 1/p (x axis) and 1/q (y-axis) and take the
y-intercept (c) to find the value of f.
Show how to calculate the focal length (f) of a concave mirror.
2. Convex mirror
Distance
40
80
120
160
200
240
(p) (cm)
Image distance (q)
(cm)
1/p (m-1)
1/q (m-1)
Graph the relationship between 1/p (x axis) and 1/q (y-axis) and take
the value of the y-intercept (c) to find the value of f.
Show how to calculate the focal length (f) of a convex mirror.
3. Concave lens
Distance (p)
60
100
140
180
220
260
(cm)
Image distance
(q) (cm)
1/p (m-1)
1/q (m-1)
Graph the relationship between 1/p (x axis) and 1/q (y-axis) and take the
value of the y-intercept (c) to find the value of f.
Show how to calculate the focal length (f) of a concave lens.
4 Convex lens
Distance
160
180
200
220
240
260
(p) (cm)
Image Distance
(q) (cm)
1/p (m-1)
1/q (m-1)
Graph the relationship between 1/p (x axis) and 1/q (y-axis) and take the
value of the y-intercept (c) to find the value of f.
Show how to calculate the focal length (f) of a convex lens.