Light

• A luminous object transmits their own light.
• A non luminous object does not transmit their own light but rather absorbs or reflects it.
• Light travels in straight lines.
• Source - a place person or thing from which something originates from or can be obtained
• Emit - produce or give out something
• Reflect - a change in the direction of light waves that hit a light wave
• Absorb - take in or soak up by chemical or physical action
• Luminous - objects that emit light on their own
• Transmit - to cause light, heat or sound to pass through a medium
• Transparent -light completely passes through
• Translucent - allowing light, but not detailed shapes to pass through; semi-transparent
• Opaque - where no light is able to pass through
• Vacuum - where there're no particals
• Wave - A wave transfers energy or light
• Light is a transverse wave and doesnt need particals
• Light travels as a wave
• Shadows are proof Light travels in a straight line
• If the oscullations (vibrations) in a wave are perpendicular to the direction of the wave travel it is a transverse wave
• Light travels at 300,000,000 m/s
• Light can travel through a vacuum ( absence of particals ) e.g space for example the sunlight coming to earth
• Lines are drawn in straight lines
• Transmission - all the light passes through the object
• Reflection - when light hits a smooth and shiny surface and bounces of it
• Refraction - when light hits the surface it passed through but changes direction, this happens when light goes from one medium to another
• Absorption- when a light is taken in through an object
• Light waves transfer energy from one place to another
• When light hits a surface, it will produce a chemical or electrical effect
• When light waves transfer energy from the sun to the solar cells, it creates a electrical reaction as it gets a flow of electrons
• When a light wave hits a transparent material, most of it energy is transmitted
• If a light wave hits a black or Opaque material, it will Absorb the energy transferred by the wave.
• The pupil is the hole in front of your eye where light goes in.
• The method of drawing a Refraction diagram involves placing the glass block and prism in the middle of the page and drawing around it, drawing the normal perpendicular to the top of the block, shining the ray of light, at an angle where the normal line meets the block, marking with x's where the light ray is entering and leaving, using a ruler to join the x's up to trace the lights path, and using a protractor to measure the angle of incident and angle of refraction.
• Photoreceptors, rods and cones, are found on the retina.
• The optic nerve are nerves that carry electrical messages to the brain.
• If we shine light perpendicular to the prism, i.e 90° to the prism along the normal line, it will shine through as there is no angle.
• Refraction is when light changes direction going from one medium to another.
• A medium is something that contains particles.
• Cones detect bright light and colour.
• The incident ray hits the prism.
• The light is now traveling from a more dense medium to a less dense medium therefore the light will speed up and change direction.