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# Unit 1: Light – reflection & refraction

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## About this unit

When light travels from one medium to another (like air to glass, or glass to water), it does three things. Some of it bounces off, some of it goes through, and the rest of it is absorbed. In this chapter, we will explore the first two. We will explore what rules govern them, their technical names and then apply these rules to study the beautiful world of curved mirrors and lenses.### Practice

- Ray diagramsGet 3 of 4 questions to level up!
- Ray diagrams and curved mirrorsGet 3 of 4 questions to level up!

### Practice

- Sign conventionGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 320 Mastery points

### Learn

### Practice

- Using the mirror formulaGet 3 of 4 questions to level up!
- Using the magnification formula for mirrorsGet 3 of 4 questions to level up!
- Nature and size of images from magnificationGet 3 of 4 questions to level up!
- Concave and convex mirrorsGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 320 Mastery points

### Practice

- Snell's law of refractionGet 3 of 3 questions to level up!

### Learn

### Practice

- Refractive index and the speed of lightGet 3 of 4 questions to level up!
- Connection between relative and absolute refractive indicesGet 5 of 7 questions to level up!

### Learn

### Practice

- Image formation in spherical lensesGet 3 of 4 questions to level up!
- Paths of light rays through spherical lensesGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 400 Mastery points

### Learn

### Practice

- Using magnification formula for lensesGet 3 of 4 questions to level up!
- Using the lens formulaGet 3 of 4 questions to level up!
- Convex and concave lensesGet 3 of 4 questions to level up!

### Practice

- Power of lensGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 320 Mastery points

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Level up on all the skills in this unit and collect up to 1700 Mastery points!