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  2. Year 8
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Sight and Cameras

This worksheet explores the structure of the eyes and the application of this on cameras.

'Sight and Cameras' worksheet

Key stage:  KS 3

Curriculum topic:  Physics: Waves

Curriculum subtopic:  Light Waves

Difficulty level:  

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Worksheet Overview

QUESTION 1 of 10

We see things because light reflects off them and then enters our eyes. Look at the diagram below:

 

 

Light enters our eyes through the pupil, it goes through the lens, which 'sends' an image to the retina at the back of our eye; the image formed is tiny and upside down. The retina then changes light energy into electrical signals (called impulses). The impulses are sent to the brain along the optic nerve and the brain allows us to see the image the right way up.

 

Cameras work in the same way: in the simplest cameras (the pinhole cameras) light goes through a tiny hole and forms an upside down image at the back of the camera. Cameras, like the eyes, can control how much light enters them. Too much light can damage the eyes so the pupil gets smaller when it is very bright. Similarly, they get bigger in dim light, to allow more light in.

How do we see things?

Light reflects off them and scatters around.

Light refracts off them and enters our eyes.

Light reflects off them and enters our eyes.

Which part of the eye does the light enter through?

pupil

retina

iris

Where does light go after the pupil?

through the retina

through the lens

back out of the eye

What does the lens in our eyes do?

it sends a tiny upside-down image to the retina.

it sends a big upright image to the retina.

it sends a tiny upside down image to the brain.

Where is the retina?

at the front of the eye

at the back of the eye

in the middle of the eye

Where is light energy converted into electrical signals?

the lens

the brain

the retina

What is the name of the nerve that impulses travel along as they are sent to the brain?

the metric nerve

the auditory nerve

the optic nerve

What is the simplest type of camera called?

SLR camera

pinhole camera

film camera

Is the following sentence true or false?

 

Light goes through the tiny hole at the front of a camera and an image is formed at the side of the camera upside down.

true

false

Complete the following sentence by selecting one of the options below:

 

The pupil gets bigger when........

there is dim light.

there is bright light.

there is sunlight.

  • ANSWERS
  • Question 1

How do we see things?

CORRECT ANSWER
Light reflects off them and enters our eyes.
EDDIE SAYS
Light is reflected off objects and enters our eyes. This is how we see.
  • ANSWERS
  • Question 2

Which part of the eye does the light enter through?

CORRECT ANSWER
pupil
EDDIE SAYS
Light enters our eyes through the pupil.
  • ANSWERS
  • Question 3

Where does light go after the pupil?

CORRECT ANSWER
through the lens
EDDIE SAYS
After the pupil, light travels through the lens.
  • ANSWERS
  • Question 4

What does the lens in our eyes do?

CORRECT ANSWER
it sends a tiny upside-down image to the retina.
EDDIE SAYS
Light goes through the lens, which sends a tiny upside down image to the retina at the back of the eye.
  • ANSWERS
  • Question 5

Where is the retina?

CORRECT ANSWER
at the back of the eye
EDDIE SAYS
The retina is at the back of the eye.
  • ANSWERS
  • Question 6

Where is light energy converted into electrical signals?

CORRECT ANSWER
the retina
EDDIE SAYS
The retina converts light energy into electrical signals.
  • ANSWERS
  • Question 7

What is the name of the nerve that impulses travel along as they are sent to the brain?

CORRECT ANSWER
the optic nerve
EDDIE SAYS
Impulses travel along the optic nerve to the brain.
  • ANSWERS
  • Question 8

What is the simplest type of camera called?

CORRECT ANSWER
pinhole camera
EDDIE SAYS
The simplest camera ever made is called the pinhole camera, because the tiny hole at its front can be made using a pin.
  • ANSWERS
  • Question 9

Is the following sentence true or false?

 

Light goes through the tiny hole at the front of a camera and an image is formed at the side of the camera upside down.

CORRECT ANSWER
false
EDDIE SAYS
The image is formed at the back of the camera like in the eye.
  • ANSWERS
  • Question 10

Complete the following sentence by selecting one of the options below:

 

The pupil gets bigger when........

CORRECT ANSWER
there is dim light.
EDDIE SAYS
The pupil gets bigger in dim light to let more light in, so we can see better.
---- OR ----

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