science 8 chapter 2 section 3 Flashcards
Rod cells shape is
Cylinder
Cone cells shape is
Cone shaped
Rod cells only detect
Black and white
Cone cells detect
Red green and blue and sometimes mixes them together
Light passes through the cornea getting
Mostly focused
A microscope has how many lens and what type are they
Two convex lens
A refracting telescope has how many lenses and what type are they
Two objective lens
How many optical devices does a reflecting telescope have and what are they
1 concave mirror one plane mirror and one convex lens
Binoculars have how many optical devices and what are they
One objective lens and two prisims
The retina is where
The image is formed
The cornea
Protects the eye
The iris
Controls the amount of light entering the eye
The concave lens
Focuses the image on the retina
The scelera
Holds the eye together
The optic nerve
Transmits qlsignals from the light receptors in the retina to the brain
Shutter
Opens to take a picture
Ccd
Changes light to electricity
Lens cover
Protects the lens
Diaphragm
Opens and closes the aperture according to brightness of the subject
Cameras are used to
Take a visual record of something
Lasers are
Intense beams of focused light
Fiber optics are
Glass which carry light signals
Four types of blindness are
Snow
Night
Colour
Colour vision diffency
Far sighted people can fix there problem with
Convex lens
