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light - Coggle Diagram
light
light
The Sun is the major source of light.
Other natural sources of light include fireflies, sparks, and flames.
The Sun and fireflies are called luminous objects that are able to emit light on their own.
Divergent Beam
Light rays spread out from a light source.
Convergent Beam
Light rays move towards a focal point.
Parallel Beam
Light rays travel parallel to one another.
Reflection
It is the bouncing off of light rays by objects when the light rays hit on them.
Transmission
light travels through a medium without being absorbed
Absorption
It takes place when an object does not reflect or transmit the light.
Opaque
Does not allow light rays to pass through at all.
Translucent
Allow only some light rays to pass through.
Transparent
Allows light rays to pass through completely.
PROPERTIES OF LIGHT
Light is a form of energy.
Light is a form of energy.
When light hits a surface, it can be reflected or refracted.
The speed of light is 3 x 10⁸ m/s in vacuum.
REFLECTION OF LIGHT
Normal
A line drawn at a right angle (90°) to the mirror's surface where the incident ray strikes.
Incident Ray
A light ray that strikes a surface.
Reflected Ray
A light ray that leaves a surface.
Angle of Incidence (i)
The angle between the incident ray and the normal.
Angle of Reflection (r)
The angle between the reflected ray and the normal.
TYPES OF REFLECTION
Light rays are reflected in many directions by an uneven surface.
An observer cannot see his reflection clearly
because not all of the reflected light rays is directed towards his eyes.
Light rays are reflected by a smooth and flat surface
in a regular manner at the same angle
and the reflected rays are parallel to one another.
An observer can see his reflection on the surface when his eyes detect the reflected light rays.
Plane mirrors have a smooth and flat surface.
They reflect light when light rays strike on them.
Virtual
No actual light rays meet at the image position.
Upright
Laterally inverted
Same size as the object
Distance of object and image from the plane mirror is equal
The image is as far behind the mirror as the object is in front of the mirror.
The object and its image have the same dimensions such as height.
The left-hand side of the object appears to be the right-hand side of the image and vice versa.
The object and its image has the same orientation of right-side up.
The image formed by a plane mirror obeys the laws of reflection.
The characteristics of an image formed by a plane mirror:
COLOUR
White light consists of seven colour components.
White light can be split into its seven colour components by a glass prism.
This is because the light components travel with different speeds in the glass prism
, so they are refracted at different angles.
they are separated into individual components.
A spectrum of colours can be dispersed and recombined by using two glass prisms.
The colour components of white light can be classified into primary colours and secondary colours.