Light and Optics Review for Final Exam

Light and Optics Review for Final Exam

Describe the difference between transparent, translucent and opaque

Transparent materials allow light to be transmitted straight through and so we can see images clearly, translucent materials allow light through but it is scattered so that images are blurry and opaque materials totally block light from getting through

What is a ray of light?

A ray is a straight line that represents the path of light

What is evidence that light travels in straight lines?

Formation of shadows

If the man in the picture moved closer to the wall, what would happen to his shadow?

It would get smaller and less fuzzy

Describe chemiluminescence, bioluminescence, incandescence and fluorescence

Chemiluminescence is light that is produced from a chemical reaction

Bioluminescence is light that is produced from a chemical reaction but it is in a living (bio) organism

Incandescence is the formation of light by heating something up to a very high temperature

Fluorescence is the formation of light by the absorption of ultraviolet light

What causes refraction?

Refraction is caused by the speeding up or slowing down of light as it moves into a substance with a different density

Describe what causes this pencil illusion

This pencil illusion is caused by refraction or the bending of light as it moves through materials of different densities

During refraction, when light travels into a substance that is more dense, it bends __towards______(towards or away from) the normal. When light travels into a substance that is less dense, it bends __away from___ (towards or away from) the normal.
Draw the normal line on the pencil picture

Is the normal line parallel or perpendicular to the surface of the water?

Normal line is perpendicular

What causes a mirage?

A mirage is an illusion that happens when the brain tries to interpret what sensory information it is receiving from the eye. It interprets this information based on past experience or what it expects to happen

Draw a diagram of the eye and label each part.

Identify the camera parts that perform the same function as eye parts

film-retina

lens-lens

aperture-pupil

diaphragm-iris

lens cover-eyelid

focussing ring-ciliary muscle

protective glass-cornea

Draw a diagram of a far-sighted eyeball and show the position of the focal point

normal eye

Draw a diagram of a near-sighted eyeball and show the position of the focal point

Draw a simple diagram of a reflecting telescope and identify/label the parts

In reflection, the angle of incidence _____equals______(equals, is greater than or is less than) the angle of reflection
Describe the image you see in a convex mirror and lens

mirror-made smaller, lens-larger

Describe the image you see in a concave mirror and lens mirror-magnified, lens-made smaller