Can I Believe My Eyes? IQWST Grade 6 Unit 1 Assessment

John and Justin are playing hide and seek at home. From the back of a room, John says he can see Justin around the corner in the next room. Is John cheating, or can he see around the corner? What is the explanation for your answer?

• John is not cheating. It is possible to see around corners because light can bend around corners.

• John is cheating. The light that hits Justin needs an unblocked straight path to John’s eyes in order for him to see Justin. The corner blocks the straight path of light.

The power is out in your house, and you want to call a friend to see if the power is out in her house too! But your phone is in your backpack! You put your backpack down somewhere before the power went out and you cannot remember where it is. First, you must find the backpack in the dark using a flashlight.

How are you able to see the backpack?

• Light bounces off the backpack in all directions.

• Light only bounces off the backpack to my eye.

• Light is absorbed by the backpack.

The power is out in your house, and you want to call a friend to see if the power is out in her house too! But your phone is in your backpack! You put your backpack down somewhere before the power went out and you cannot remember where it is. First, you must find the backpack in the dark using a flashlight.

How does the light reaches your eye?

• All of the light travels from the backpack to your eye, allowing you to see.

• Some of the light travels from the backpack to your eye, allowing you to see.

How does the pupil help you see?

• It keeps out the light.

• It stays the same size and lets in all of the light.

• It changes size to let in enough light to see.

What cells in the retina help you see color?

• cones

• rods

What cells in the retina help you see in low light but do not see color?

• rods

• cones

What sends the information you see to your brain?

• retina

• iris

• optic nerve

• cornea

In the following picture, how does the house make a shadow?

• The house blocks all the sunlight from reaching the ground.

• The house blocks the sunlight creating a shadow on the ground where no sunlight reaches. The light only reaches the area surrounding the shadow.

• Houses always make shadows whether there is a source of light or not.

What is one thing wrong with the picture?

• The shadow is too tall.

• The shadow is not dark enough.

• The shadow is too wide.

• The shadow is not the correct shape.

Why is the shadow on the wrong side of the person in the picture?

• The shadow is going toward the light source.

• The shadow is going away from the light source.

• The shadow has a mind of its own.