7.2 absorbing,,transmitting and;reflection
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This document discusses the behavior of light rays and how vision works. It contains the following key points: 1. When light rays reach a surface, they can be absorbed, reflected, transmitted, or refracted. Absorption converts light to heat, reflection bounces light off a surface, transmission passes light through a material, and refraction changes the direction of light when moving between materials. 2. For vision, light reflects off an object and enters the eyes, causing a chemical reaction at the back of the eye that produces a signal to the brain, allowing us to see objects that do not emit their own light. 3. Shadows are caused when an object blocks light from a source, creating
7.2 absorbing,,transmitting and;reflection
- 1. 7.2 TRANSMITTING, ABSORBING & REFLECTING SIR.MUHAMMAD
- 2. THE BEHAVIOUR OF LIGHT RAYS ● When the light rays reaches a surface four things can happen: 1- The light can be absorbed. The energy from a ray of light is transformed into heat energy warming up an object 2- The light can be reflected. The light ray hits a material and bounces off 3- The light can be transmitted. The light ray passes through a material. 4- The light ray can be refracted. The light ray changes direction when it moves from one transparent material to another
- 3. SIR.MUHAMMAD – VIII CAMBRIDGE DESCRIBE THE SEQUENCE OF EVENTS THAT ENABLES YOU TO SEE AN OBJECT THAT DOES NOT PRODUCE ITS OWN LIGHT ?!!
- 4. MECHANISM OF VISION 1-The light falls on the object 2-The the object reflects light 3-The reflected light enters our eyes 4-The reflected light causes a chemical reaction at the back surface 5-The chemical reaction produces a signal that reaches our brains .
- 5. EXPERIMENTING WITH SHADOWS Shadows are caused when an object blocks out the light from a light source . This creates dark areas that are not illuminate by light source 1- SHARP SHADOW : if the source of light is small then the shadow will have sharp edges .None of light source can reach the screen but lots of light can reach the other areas. This gives clear edges to the shadow 2- BLURRED SHADOW : when there is a large light source, the edges of shadows can become blurred. This is because light from some parts of the light source can still reach the screen while some of the light is blocked.
- 6. Past Papers