science 8 chapter 2 section 3

Question 1

Rod cells shape is

Answer 1

Cylinder

Question 2

Cone cells shape is

Answer 2

Cone shaped

Question 3

Rod cells only detect

Answer 3

Black and white

Question 4

Cone cells detect

Answer 4

Red green and blue and sometimes mixes them together

Question 5

Light passes through the cornea getting

Answer 5

Mostly focused

Question 6

A microscope has how many lens and what type are they

Answer 6

Two convex lens

Question 7

A refracting telescope has how many lenses and what type are they

Answer 7

Two objective lens

Question 8

How many optical devices does a reflecting telescope have and what are they

Answer 8

1 concave mirror one plane mirror and one convex lens

Question 9

Binoculars have how many optical devices and what are they

Answer 9

One objective lens and two prisims

Question 10

The retina is where

Answer 10

The image is formed

Question 11

The cornea

Answer 11

Protects the eye

Question 12

The iris

Answer 12

Controls the amount of light entering the eye

Question 13

The concave lens

Answer 13

Focuses the image on the retina

Question 14

The scelera

Answer 14

Holds the eye together

Question 15

The optic nerve

Answer 15

Transmits qlsignals from the light receptors in the retina to the brain

Question 16

Shutter

Answer 16

Opens to take a picture

Question 17

Ccd

Answer 17

Changes light to electricity

Question 18

Lens cover

Answer 18

Protects the lens

Question 19

Diaphragm

Answer 19

Opens and closes the aperture according to brightness of the subject

Question 20

Cameras are used to

Answer 20

Take a visual record of something

Question 21

Lasers are

Answer 21

Intense beams of focused light

Question 22

Fiber optics are

Answer 22

Glass which carry light signals

Question 23

Four types of blindness are

Answer 23

Snow
Night
Colour
Colour vision diffency

Question 24

Far sighted people can fix there problem with

Answer 24

Convex lens