Lights/Optics Flashcards
It looks like a lot of questions, but it's mostly one sentence answers
What is colorblind?
When cells are unable to detect certain, or any, colours
What do cones do?
Detect colour
What do rods do?
Detect the presence of light
What is light and energy?
Light is a form of energy we can see.
Remember that energy is NOT matter so it is not made of particles.
Energy cannot be created or destroyed - it can only be transferred OR transformed.
What does emit mean?
Means to send out light typically in a ray fashion
What happens when light is absorbed by a surface?
It can also be transformed into other forms of energy including thermal, electrical or chemical energy.
What is opaque?
Lets no light pass through and forms a shadow
What is translucent?
Lets only some light go through (not all) and forms a shadow that is very light and no image is visible
What is transparent?
Lets light pass through with no shadows formed
What is reflection?
The process where light is bounced off of a surface.
Reflection is the reason we can see anything!
What is the incident ray?
Comes from the light source and hits the surface.
What is the reflected ray?
Bounces off the surface
What is the normal line?
90 degree angle to the reflecting surface at the incident ray interface
What is the angle of incidence?
Angle between the normal line and the incident ray
What is the angle of reflection?
Angle between the normal line and the reflected ray
What is a plane mirror?
A flat mirror
What is a concave mirror?
Mirror curves inward
What is a convex mirror?
Mirror curves outward
What is nearsightedness?
A person can see things close up, but they are blurry if far away.
The eye focuses the light rays too soon - the focal point occurs in front of the retina.
What does the ciliary muscle do?
Adjusts thickness of lens to focus on near/far objects
What does the lens do?
Focuses light so the image hits the retina
What is the aqueous humour?
Fluid between eyeball and cornea
What is the pupil?
Hole where light enters
What is the cornea?
Clear covering over the eye to protect it
What does the iris do?
Adjusts pupil size based on brightness
What does the retina do?
Receives light; image formed here.
What does the optic nerve do?
Transmits signal from light receptors in retina to brain
What is the vitreous humour?
Fluid inside eyeball which to helps keep its shape
