PS1 - Learning Set 1 Review

Which of the following statements correctly uses the 4 conditions of light to see an object?

• light, sight, object, and sun
• The light from the sun shines into my eyes.  It reflects from my eyes to the object in a straight, unblocked path.  This allows me to see the sign.
• The light from the flashlight travels in straight lines to the sign.  Light reflects from the sign to my eyes because there is a straight, unblocked path between the sign and my eyes.

• light, sign, eyes, straight unblocked path

Why is this light model incorrect?

• There are too many arrows.
• Light does not travel from the light to the eye.
• The arrow from the object to the eye is in the wrong direction.
• The arrow from the light to the object is in the wrong direction.

How do shadows form?

• The darkness of the shadow reflects back to the eye.
• A shadow is formed behind an object that blocks the path of light.
• Shadows can only form when there is no light.

True or False:  A shadow is always found between the light source and the object.

• True
• False

True or False:  Nocturnal animals like an owl can see in total darkness.

• True
• False

True or False:  Scientists often update their models to make them better or include new ideas.

• True
• False

When a light sensor "sees" an object, it detects:

• the object.
• the shadow of the object.
• the light coming from an object.

What might be a possible explanation for the shadow of hand in this picture.

• A giant is chasing the girl.
• The hand is close to the light source, making it large.
• The hand is far from the light source, making it large.

How do you know that the image above is wrong?

• The size of the shadow must be the same as the size of the object.
• The color of the shadow must be the same as the object.
• The shape of the shadow must be the same as the object.

Since the shadow of the flower is behind the flower, where is the light coming from? 

• From the right side of the flower
• From the left side of the flower
• From in front of the flower
• From behind the flower