Light and Colours. Done by: Soon Wei Jun (23) 2P4. Properties of Light . Travels in straight line Form of energy When it hits an object, it can either be reflected or refracted. Travels at a super fast speed in vacuum. When does Light get reflected/refracted??. Reflection:
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Done by: Soon Wei Jun (23)
Light is reflected when it hits an opaque object
Light is refracted when it enters a transparent medium of different density…
1.Incident ray – light ray coming towards surface
2.Reflected ray – light ray bouncing off the surface
-Takes place when light rays are incident on smooth surface; so they are reflected in a regular manner
-Takes place when light rays are incident to rough surface; so are reflected in diffused manner
- Do you know that there are different kinds of mirrors, where each of them have different uses/purposes!!
-Decorative purposes to make the room appear bigger
-As a rear mirror to see traffic behind a vehicle
-As periscope where the user can see any object around the corner
-Allows us to see things around a bend
-As a side window to have a wider field of vision to drivers
-Surveillance purposes: For wider view to observe people in a room to spot shoplifters
-Dental: magnify the teeth image
-In a microscope to magnify microorganisms
-Cosmetic mirrors whereby it can help by magnifying face image
-It is actually the bending of light rays when they travel from one transparent medium to another transparent medium..
-Only possible with the change in speed of the light rays
n(reflective index) = sin incident/sin reflaction
1.Light travelling perpendicular to boundary of media, even if have different densities
2. Light passes through two media of the exact same densities
Place a straw in a cup of water and look at the straw by the sight of the cup.. What do you see?
This is the phenomena which we call refraction!
-Composed of seven colour components
-Each one refracts at different angel
-So white light will be dispersed by prism and displays a spectrum of seven colour components