Show:
Characteristics of Light
Lenses
Mirrors
Refraction
How we see colouur
100
What is a wave length?
Distance from one crest/trough to the next.
100
What is a lens?
Pieces of glass/plastic that has a curved ratio.
100
Define S.A.L.T
Size Attitude Location Type
100
What is the medium?
The substance through which light travels.
100
True or false A ray is an arrow that shows the direction light is traveling.
True
200
Name the two types of light emisson's.
-non-luminous -luminous
200
Why are eye such an important organ?
Allow us to observe and the sense of sight.
200
Fill in the blanks A concave mirror forms a _________ image when the object is between the centre of curvature & the focal point.
-Real
200
Define Refraction.
Change in direction of light when it crosses two objects or substances.
200
Fill in the blanks Wax is an example of a _______ object and a book is an example of a _______ object.
-Translucent -Opaque
300
What are 4 examples of useing fluorescence light?
-The arts -Health care -forensic investigators -paper currency
300
True or False Convex mirror lenses move together & its the thinniest in the middle.
False move apart & thickest.
300
Explain the difference between convex & concave mirrors.
convex mirrors cause light to diverge (come apart) concave mirrors cause light to converge (come together)
300
Explain the concept of total internal reflection.
When no light can escape two substances the angle of incidence is very large in other words.
300
How does light interact to give objects colour?
By a ray, an arrow that show the direction in which light travels.
400
Describe the difference between chemiluminescence & bioluminescence.
Chemiluminescence is light made by chemicals & gives/creates a chemical reaction, whil ioluminscence is light produced by living organisms.
400
What are the first three parts of the eye the light travels through?
cornea, pupil, len's
400
Name 3 curved mirror terminology & describe them.
PA- a straight line that passes through the center of curvature C- centre of the sphere that the sirror sits on V- point where the principal axis meets the mirror F- where reflected rays meet when incicdent rays parrallel to axis F- distance from mirror to focal point
400
Explain how refraction is differnt from reflection.
Refraction is when light changes direction as it passes through two substances, Reflection is when light bounces off an object & changes direction.
400
How do opaque objects absorb or reflect light?
Colour on a object appears to be, is determined by the colours of the light that are being reflected by its surface and colours that are absorbed by the object.