science unit 3, 4-5 wrap up

Question 1

Convex

Answer 1

a mirror or an object that bends or curves outwards, or a lens that is thicker in the middle and small on the edges

Question 2

Concave

Answer 2

A mirror or object that bends or curves inwards, or a lens that is thicker on the edges and smaller in the middle

Question 3

Optic Nerve

Answer 3

the nerve that connects the eye to the brain, and the point where the optic nerve enters the retina has no light sensing cells, making a blind spot

Question 4

Cornea

Answer 4

The clear outer layer on the eye that helps focus light so you can see clearly.

Question 5

Iris

Answer 5

The colored part of the eye that regulates the amount of light that enters the eye.

Question 6

Aperture

Answer 6

the opening in the diaphragm of a camera; can let more light reach the film by opening wider.

Question 7

Far and Near Sighted

Answer 7

Far sighted- unable to see close objects clearly. Near sighted - Unable to see distant objects clearly.

Question 8

Eye Piece

Answer 8

In a telescope or microscope, the lens that works as a magnifying glass to enlarge the image

Question 9

Objective Lens

Answer 9

The convex lens in a refracting telescope or microscope.

Question 10

objective mirror

Answer 10

the mirror in a reflecting telescope that reflects the light to a plane mirror, which reflects it so that it converges

Question 11

Know how light rays pass through different lens’

Answer 11

When light rays pass through a convex lens they will bend toward each other, or converge at one focal point
When light rays pass through a concave lens they will bend away from each other, never converging and spreading out.

Question 12

Describe the attitude and type of image viewed on a screen and through a lens.

Answer 12

The attitude of the image depends on the type of the image. Real images are always inverted ( example image on a movie screen being projected by a projector) while virtual images are always upright (reflection in a mirror)

Question 13

Know the difference between a refracting and reflecting telescope

Answer 13

A refracting telescope uses a convex lens, called the objective lens, that refracts the light so it converges at a single point near the eyepiece lens, making a real image of the distant object and magnifying the image.
While a reflecting telescope uses a concave mirror, called the objective mirror, that reflects the light rays toward a plane mirror, which reflects the light rays toward the eyepiece, where they converge to create a real image of the distant object and it magnifies the image.