Unit 6.1 Review

Light travels in:

• Curved paths

• Straight lines until it hits something

• Spirals

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NGSS.MS-PS4-2

Which of these materials is transparent (see through)?

• Wood

• Wax paper

• Glass

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When light bounces off a surface, this is called:

• Refraction

• Transmission

• Reflection

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Which structure in the eye changes shape to focus light on the retina?

• Lens

• Iris

• Pupil

What does the pupil do?

• Sends signals to the brain

• Controls how much light enters the eye

• Changes light into electrical signals

​ (a)   is when light passes through an object .

• Transmit
• reflect
• retina
• optic nerve

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NGSS.MS-PS4-2

The _____________ is the layer of cells at the back of the eye that translates light into electrical signals.

(a)  

• retina
• pupil
• optic nerve
• lens

The _____________ carries messages from the eye to the brain.

(a)  

• optic nerve
• retina
• lens

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What are the different parts of the human eye visible in this diagram?

a

b

c

d

e

Retina

Optic Nerve

Pupil

Lens

Iris

Why does a shadow form when an object blocks light?

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