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Reflection and Refraction of Light — Free MYP3 Sciences Practice Questions
1QuestionApplications of Reflection and Refraction in TechnologyConcept Practice
3 marks~5 minCriterion A
A student builds a periscope using two plane mirrors, each tilted at to the horizontal inside a vertical tube. An object is in front of the top mirror. The vertical distance between the two mirrors is .
a
State the angle of incidence and the angle of reflection as the light ray strikes the top mirror. [1]
b
Describe the complete path of the light ray from the object to the observer's eye, naming the direction of travel at each stage. [1]
c
A second student claims that the total distance the light ray travels inside the tube is . Calculate the actual distance the light ray travels inside the tube and explain whether the second student is correct. [1]
Solutions
2QuestionApplications of Reflection and Refraction in TechnologyAssessment Practice
4 marks~6 minCriterion C
The diagram shows a periscope with two mirrors, each angled at to the vertical. A light ray enters horizontally through the top opening.
a
Describe the complete path of the light ray from the top opening to the bottom opening. [1]
b
Explain how the law of reflection causes the light ray to change direction by at each mirror. [2]
c
A student claims that tilting one mirror to would still allow the light ray to exit through the bottom opening. Using your knowledge of reflection, explain whether this claim is correct. [1]
Solutions
3QuestionPlane Mirrors and Image PropertiesConcept Practice
5 marks~8 minCriterion B
A student investigates how images form in a plane mirror by measuring object distance and image distance from the mirror.
| Object distance (cm) | 10 | 20 | 30 | 40 | 50 |
|---|---|---|---|---|---|
| Image distance (cm) | 10 | 20 | 30 | 40 | 50 |
a
Plot the data on a graph with object distance on the x-axis and image distance on the y-axis. Use a scale of 0–60 cm on both axes and draw a line of best fit. [2]
b
Describe the relationship shown by your graph between object distance and image distance. [1]
c
A second student claims that if the object is placed 35 cm from the mirror, the image will appear 40 cm behind the mirror. Use the relationship from your graph to explain whether this claim is correct. [2]
Solutions
4QuestionLaws of Reflection and Ray DiagramsAssessment Practice
8 marks~12 minCriterion D
A solar power plant uses a field of flat mirrors called heliostats to reflect sunlight onto a central tower. Drivers on a nearby highway report being blinded by reflected light, particularly in the late afternoon.
a
Draw a ray diagram showing a flat mirror, the normal line, an incident ray from the sun, and the reflected ray. Label the angle of incidence () and the angle of reflection (). Use your diagram to explain how sunlight can be directed toward the highway. [2]
b
Plant operators tilt the mirrors slightly downward. Explain how this adjustment follows the law of reflection and redirects the reflected light away from the highway. [2]
c
Analyse the impact of this solar plant on the local community and on highway safety. In your response:
- discuss one advantage of the solar plant for the local community
- identify one safety concern for highway drivers
- explain one limitation of using a simple flat-mirror ray diagram to represent this real-world situation [4]
- discuss one advantage of the solar plant for the local community
- identify one safety concern for highway drivers
- explain one limitation of using a simple flat-mirror ray diagram to represent this real-world situation [4]
Solutions
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