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Light Reflection and Refraction Revision
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Light Reflection and Refraction Revision
At a music festival, the stage lights show how light behaves. Answer each question using the information in the worksheet. For ray diagrams, show arrowheads and label the normal.
Investigate reflection
Use the festival situations to revise reflection.
1.At the festival, a narrow beam hits a smooth plane mirror. What is the law of reflection?
- The angle of incidence equals the angle of reflection, measured from the normal.
- The angle of incidence is always twice the angle of reflection.
- Light bends every time it meets a surface.
- The reflected ray travels along the normal.
2.Which surface is most likely to produce a sharp reflection of the stage lights?
- A smooth mirror
- Rough concrete
- A carpeted panel
- Wrinkled fabric
3.An incident ray makes an angle of 38° with the normal to a plane mirror. What is the angle of reflection? Include the unit.
4.A beam shines onto a rough stage wall. Explain why the reflected light spreads in many directions rather than forming one clear image.
Investigate refraction
Refraction happens when light changes speed as it passes between materials. Its direction may change at the boundary; the change is measured against the normal.
5.Light travels from air into water at an angle. What usually happens to its speed and direction as it enters the water?
- It slows down and bends towards the normal.
- It speeds up and bends towards the normal.
- It keeps the same speed and always travels straight.
- It stops at the boundary.
6.Complete the sentence: The imaginary line at 90° to a surface where a ray hits it is called the .
7.A straight straw is placed in a clear drink. It appears bent at the water surface. Explain why the straw looks displaced.
8.A pool at the festival looks shallower than it really is. Explain how refraction causes this appearance.
9.Which pair are both examples of refraction?
- A pencil appearing bent in water and a ray bending through a glass prism
- A face seen in a mirror and a beam bouncing off a shiny sign
- A shadow on the ground and light absorbed by a dark curtain
- A reflection on a still pond and a shadow behind a speaker
10.A rainbow made by a prism is only reflection. Is this statement correct? Explain briefly.
11.Sort these festival examples into reflection or refraction: (a) seeing stage lights in a mirror; (b) a beam changing direction as it enters a clear plastic cover; (c) seeing your face in a shiny metal panel; (d) a straw appearing bent in water.
- (a) Seeing stage lights in a mirror
- (b) Beam changing direction entering clear plastic
- (c) Seeing your face in shiny metal
- (d) Straw appearing bent in water
- Refraction
- Reflection
- Reflection
- Refraction
12.Draw a ray diagram for light reflecting from a plane mirror when the angle of incidence is 30°. Include the mirror, normal, incident ray, reflected ray, and both angles. Use the law of reflection.
13.Draw a simple ray diagram showing light passing from air into water. Label the boundary, normal, incident ray and refracted ray, and show which way the ray bends.
3 printable pages
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