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North East School Division Unpacking Outcomes Unpacking the Outcome Examine how waves refract Outcome (circle the verb and underline the qualifiers) PS20-PW3 – Analyze, using physical materials, ray diagrams, and mathematical equations, how waves refract at boundaries between different media. KNOW UNDERSTAND BE ABLE TO DO Key vocabulary – ray, refraction, reflection, critical angle, total internal reflection, refractive index, medium converging/diverging lenses, ray diagram, type (real or virtual), attitude, orientation (upright or inverted), position (relative to optical center), fibre optics, polarization, wave, boundary, magnification The students will understand that: Light bends as it passes from one medium to another Light speeds up/ slows down when travelling from one medium to another Bending (refraction of light) and change in speed of light are related to one another We have special names for characteristics of images We can calculate bending of light (refraction) and change in speed mathematically Refraction has many important applications in our everyday lives Prior knowledge – properties, characteristics of one, two and threedimensional transverse waves, ray diagrams, mathematical equations for reflection of waves Concepts/ Skills to be learned Snell’s law and application How to examine and investigate How to identify image characteristics for converging and diverging lenses Examine the behavior of waves, including partial reflection and refraction, the critical angle, and total internal reflection, at a boundary between different media. Relate refraction, and the refractive index of a medium, to the change in the speed and direction of waves at a boundary between different media. Investigate image formation in converging and diverging lenses, including constructing ray diagrams. Identify the characteristics, including type (real or virtual), attitude/orientation (upright or inverted), magnification (smaller, larger, or same size), and position (relative to the optical center) of images formed in converging and diverging lenses. Apply Snell’s Law and the magnification and lens equations to solve problems related to the refraction of waves. Explore applications related to fibre optics, lenses, and human vision including polarization, the lens makers equation, and total internal reflection. ESSENTIAL QUESTIONS Why does your fishing rod appear to break when you stick it in water? Why are we learning all of these new words? Why is science like a language? Why did the internet go down today? Why do some people wear glasses? How is it that we can make a fire with a magnifying glass? Doesn’t love make a diamond shine? Why does the paramecium appear so large under a magnifying glass? How do telescopes make planets and stars look so large?