light and optical systems

grade 8

What is light?

a form of energy

what is the difference between light absorption, light transmission, and light reflection? 

light absorption is when the leight gets absorbs in an object, light transmission when light goes through an object, and light reflection when light bounces of a smooth shiney surface 

What is the law of reflection? 

Angle of inc.= Angle of ref. 

How does light behave when it strikes a concave mirror? A convex mirror? 

Concave makes it converge. Convex makes it diverge

How does light behave when it strikes a concave lens? A convex lens? 

convex makes it converge concave makes it diverge  

Human Eye vs. Camera 

Lens=lens iris= diaphragm pupil=aperture retina=film or digital sensor 

Myopia vs. Hyperopia 

Myopia is where you can see close but not far hyperopia is where you can see far but not near 

Virtuous Humour

gel-like substance that fills the space between the lens and the retina within the eye 

Lens 

A clear structure behind the pupil that refracts and focuses light. 

Cone Cells 

Allow us to detect colour

Rod Cells

Allow us to detect shapes and movement especially in low light conditions 

Aqueous Humour 

nourishes the lens and maintains pressure within the eye

Optic Nerve 

 
Nerve that transmits electrical signals from the eye to brain. Where blind spot is. 

Retina 

Tissue at back of the eye where image is formed

Sclera

An opaque tissue that surrounds the cornea and helps maintain the shape of the eye. White region around eye. 

Ciliary Muscle

Controls the shape of the lens.

iris

Colored muscle surrounding pupil. Controls the size of pupil. 

Pupil 

The opening of the eye where light enters. 

Cornea 

Transparent tissue that covers the iris and pupil. Majority of focusing happens here. 

What types of lenses can be used to correct hyperopia? Myopia? 

Myopia concave 

Hyper convex 

What are some vision enhancing technologies? 

Glasses,Lazer eye surgery ect.