Fig. 1.1 shows a green light ray from a laser entering a rectangular block of crown glass from the air.
When the green light enters the glass block from the air it will refract.
Draw the path of the refracted ray inside the crown glass block in Fig. 1.1.
Explain why green light refracts as it enters the glass block.
A student uses the green laser and the glass block to investigate the relationship between the angle of incidence and angle of refraction for this type of glass.
The table shows the student's results.
| Angle of incidence (∘^{\circ}∘) | Angle of refraction (∘^{\circ}∘) |
|---|---|
| 15 | 10 |
| 35 | 22 |
| 55 | 33 |
| 75 | 40 |
Describe a method the student could have used to investigate this relationship.
The student claims that the angle of incidence is directly proportional to the angle of refraction. Show that the student is incorrect. Use data from the table.
The student replaces the green laser with a violet laser and repeats the experiment for the same angles of incidence.
The student notices that the angles of refraction for the violet light are all different from the angles of refraction for the green light.
Explain why the angles of refraction are different when light of a different colour is used.
The student replaces the glass block with a convex glass lens and directs both the violet and orange lasers into the lens at the same time as shown in Fig. 1.2.
Complete Fig. 1.2 by continuing the paths of the violet and orange light rays.