初中物理反射,英文

1、RefractionLearning Objectives:To know what refraction is (5)And be able to draw ray diagrams for light passing through air into glass or water (7)Saturday, October 30, 2021Starter: LITERAL word searchStarter: LITERAL word search8 words 8 words Use as many of those words as you can to come up with a

2、definition for refraction Boardworks Ltd 20041 of 20 Boardworks Ltd 20062 of 47 Reflection true or false? Boardworks Ltd 20041 of 20 Boardworks Ltd 20063 of 47 Reflection ray diagramglassairThe speed of light depends on the material through which the light is travelling. Why is light refracted?When

3、light enters a different material (e.g. from air into glass), the speed of light changes.This causes the light to bend or refract.The speed of light is affected by the density of the material through which it is travelling. When light enters a more dense medium (from air into glass), its speed decre

4、ases and this is why refraction occurs.1. Place a rectangular glass block on a sheet of paper and draw around it.2. Draw a normal at 90 to the top surface of the block.3. Shine light rays, with angles of incidence i of 30, 60 and 0, into the block at the point where the normal meets the glass surfac

5、e. Record the angle of refraction r.4. Repeat the investigation for rays leaving the glass block.5. What do the results show?angle i Refraction investigationangle rWave slows down and bends towards the normal due to entering a more dense mediumWave speeds up and bends away from the normal due to ent

6、ering a less dense mediumWave slows down but is not bent, due to entering along the normalRefraction at the air-glass boundary Refraction in a glass block What happens during refraction?Draw the diagram in your book adding angles for the incident ray and the ray that comes out of the block! Refracti

7、on causes visual effects such as this ruler appearing to be bent. Effects of refractionimageHow does refraction make this stone look closer to the surface of the water than it really is?actual locationThe Archer fish is a predator that shoots jets of water at insects near the surface of the water, e

8、.g. on a leaf. The Archer f i s h a l l o w s f o r t h e refraction of light at the surface of the water when aiming at its prey. The fish d o e s n o t a i m a t t h e refracted image it sees but at a location where it knows the prey to be. image of preyprey location watch: Effects of refraction the Archer fishLight is refracted when it passes t