A point source is located to the left of a mirror.  You can drag this point source to any position.  Find the focal length of the mirror.  Start

2.

An arrow shaped object is located to the left of a mirror.  You can drag the tip of this object to any position.  Find the focal length of the mirror.  Start

Help.

3.

A light source is embedded inside an unknown substance.  You can click-drag both the position and the ray-angle for this source.  What is the index of refraction of the substance? You may assume air outside the substance.  Start

4.

A  light beam source in air is incident on a substance of unknown index of refraction.   What is the unknown index?  You can click-drag both the position and the ray angle of the beam.  Angle measurements are displayed in the yellow message box if click-drag away from the source.   Start

5.

A light source is located to the left of a lens.  You can click-drag the lens to any position.  Find the focal length of the lens.  Start

Help

6.

An arrow shaped object is located to the left of a lens.  You can drag this point object to any position.  Find the focal length of the lens.  Start

Help