Mirrors Lenses Flashcards
Opaque
Prevents light from getting through
Translucent
Most light rays get through but are scattered in all directions
Transparent
Allows light to pass through freely
What is the law of reflection
The angle of reflection is equal to the angle of incidence
What is transmit
Transmit means to give off something
Absorb
Means to take in something
What is reflect
Reflect means to bounce off something
What is refract
Refract is when light bends
Concave mirrors
Reflective surface that curves inward and can magnify objects
Convex mirror
A reflective surface that curves outward
Types of Blindness
Snow blindness, night blindness, color blindness
Concave lens
Lens that is thinner and flatter in the middle than around the edges.
Refracts light rays so they spread out
Convex lens
Thicker in the middle then around the edges focuses light rays at a focal point
Converging
Coming together at a point
Diverging
Spreading away from each other
Cone cells
Cone shaped cells located in the retina that absorb light they allow us to see color in bright light
Cornea
A transparent tissue covering the iris and pupil of the eye
Focal point
Supplant at which converging light rays meet or from which light rays diverge
Iris
Colored ring of muscle surrounding the pupil
Lens
Curved piece of transparent material that refracts in such a way as to converge or diverge parallel light rays
Optic Nerve
The nerves that connects the eye to the brain
Plane mirror
Flat smooth mirror that reflects light
Pupil
Dark transparent region in the center of the Eye where light enters
Rod cells
Cylinder shaped cells located at the retina that absorb light
Retina
The inner lining of the back of the containing light-sensitive rods and cones that convert light images into electrical signals for interpretation by the brain
Sclera
And opaque tissue surrounding the cornea
What is a line of Normal
The line of normal is where the light ray of incident meets the surface at an 90° angle which is the normal line
Snow blindness
Temporary partial or complete blindness caused by overexposure to the glare of sunlight
Night blindness
Difficult or impossible to see in dim light
Colour blindness
Only can see shades of grey and occurs in about one person in every 40000
Astigmatism
Blurred fission caused by an irregularly shaped cornea
Near-sighted vision
Focussing problem in which nearby objects are clear but distant objects are blurred
Far-sighted vision
Focussing problem in which distant objects are clear but nearby objects are clear but nearby obj. are blurred
Reflected telescope
Has concave mirror , plane mirror, and a convex lens to collect and focus light from distant objects
Refracting telescopes
Convex lens to collet and focus light from a distant object, and convex eyepiece lens to magnify the image; the lenses bend the light to focus it
Charged-culled device (CCD)
Electronic device that senses and absorbs light and provides electrical signals needed to produce a digital image
