Lenses. Learning Objectives: Explain how light travels through convex and concave lenses Explain why light is refracted
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1 Learning Objectives: Lenses Explain how light travels through convex and concave lenses Explain why light is refracted Starter Complete your refraction sheet. Use these words to fill in the gaps: towards slower bent away refraction Extension If you finish collect a spotlight science 8 book and copy keywords and their meanings into the back of your book *
2 Refraction As the light ray enters the glass block it bends. This is called refraction. The light ray refracts towards the normal as it enters the block and away from the normal as it leaves the glass block. The light is refracted because it travels slower in the glass block than air.
3 How fast does light travel? How many metres do you think light travels in one second? 300,000,000 metres (3 hundred million metres a second) IT S FAST But it takes 8 minutes for the suns light to reach us
4 Refraction How does a convex or concave lens refract light rays?
5 Extension When you have finished and packed away your experiment: 1. Collect some lenses from me. 2. What does it look like when you look through them? 3. Does it look different if you look through a convex or concave lens? 4. What happens if you look through two lenses at once? Can you make a clear image? 5. WRITE DOWN anything you have discovered.
6 Conclusion Complete the conclusion by choosing the correct words. When light rays pass through a lens they are. A lens is fat in the middle. It brings the rays of light closer together. The light rays are. The rays meet at a point called the. A lens is thin in the middle. It makes the light rays spread out. The rays of light are. diverging converging convex focus refracted concave
7 Conclusion Complete the conclusion by choosing the correct words. When light rays pass through a lens they are refracted. A lens is fat in the middle. It brings the rays of light closer together. The light rays are. The rays meet at a point called the. A lens is thin in the middle. It makes the light rays spread out. The rays of light are. diverging focus converging convex concave
8 Conclusion Complete the conclusion by choosing the correct words. When light rays pass through a lens they are refracted. A convex lens is fat in the middle. It brings the rays of light closer together. The light rays are. The rays meet at a point called the. A lens is thin in the middle. It makes the light rays spread out. The rays of light are. diverging converging focus concave
9 Conclusion Complete the conclusion by choosing the correct words. When light rays pass through a lens they are refracted. A convex lens is fat in the middle. It brings the rays of light closer together. The light rays are converging. The rays meet at a point called the. A lens is thin in the middle. It makes the light rays spread out. The rays of light are. diverging focus concave
10 Conclusion Complete the conclusion by choosing the correct words. When light rays pass through a lens they are refracted. A convex lens is fat in the middle. It brings the rays of light closer together. The light rays are converging. The rays meet at a point called the focus. A lens is thin in the middle. It makes the light rays spread out. The rays of light are. diverging concave
11 Conclusion Complete the conclusion by choosing the correct words. When light rays pass through a lens they are refracted. A convex lens is fat in the middle. It brings the rays of light closer together. The light rays are converging. The rays meet at a point called the focus. A concave lens is thin in the middle. It makes the light rays spread out. The rays of light are. diverging
12 Conclusion Complete the conclusion by choosing the correct words. When light rays pass through a lens they are refracted. A convex lens is fat in the middle. It brings the rays of light closer together. The light rays are converging. The rays meet at a point called the focus. A concave lens is thin in the middle. It makes the light rays spread out. The rays of light are diverging.
13 The eye
14 Questions 1. Is the lens in your eye convex or concave? 2. Where in your eye is the image focussed? 3. What do we call it when the light entering your eye is bent by your lens? Answers 1.Convex 2.On your retina 3.Refraction
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