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Language Skills Developed
Transferable/Scientific Skills Developed
To observe lenses, to understand, to acknowledge the physic laws that regulate the phenomena of light way through the lenses and to reproduce them with simple experiments.
The main aim is to develop the observation skills. Upon completion of this lesson, students should be able to:
- describe how beam of light refracting in lenses,
- draw the way of light trough the lenses,
- identify differences between diffuse and close-up lenses,
- solve tasks using law of light refraction and formula of focal length of the lens,
- use basic of trigonometry (sin, cos),
- know key vocabulary in English (refraction, angle of incidence, angle of refraction, absorption, index of refraction, speed of light, light beam, lenses, optical center, focal length of the lens, focus, diopter)
The linguistic aims are to teach students a correct scientific language and to give them the necessary instruments to be able to read and study a scientific article.
The specific aims are to stimulate the curiosity of the students in order to introduce the refraction of light in triangle prism. Students will be able to connect two triangle prisms and get convex lens. Observing light thought the lenses draw the way of light.
Target group age: 14 / 18 years old
Level of competence in English (CEFR): B1/B2
Time of the activity: 5 / 6 hours
Different phases to complete the lesson plan
• The time required to use the resource with the students is about 5 / 6 hours: 1 hour 30 minutes for Phase 1 - experiment, 30 minutes for Phase 2 and 1 hour 30 minutes for Phase 3. 1 hour for homework (Phase 4). 1 hour for Phase 5
• Phase one: Resources: Science Experiment - Refraction through the convex and scattering lenses. Students will be able to choose different lenses, try to confirm the law of light refraction, draw the course of light rays.
• Phase two: students at the class with the teacher will discuss about experiment, what they noticed, did the law of light refraction is right, maybe they will notice that way of the light depends on radius of curvature of the lens.
• Phase three: Teacher shows how to correctly draw way of the light through the lenses, how to measure angles of: incidence and refraction, distance between lens, body and this image. Make conclusion what same matter ratio between angle of incidence and refraction is the same size. Apply the refraction law and formula of focal length of the lens to determine unknown units: angle of: incidence, refraction, index of refraction, distance between lens, body and this image. Also, students will compare light way through a prism and water, find similarities.
• Phase four: homework – students should be able to find examples in real life, solve some exercises.
• Phase five: The videos – “Birth of the light”, “Human Eye - Passage of light through it”, reflection of the topic.
Possible difficulties for the students
Students do not usually have any difficulties because the topic is really interesting and amusing. But some of them whose level of English is poor may have difficulties understanding the content, especially applying the formulas.
Teaching Resources (created)
Teaching Resources (reviewed)
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