Section 3: Reflection & Refraction

​1. I can identify and demonstrate the difference between opaque, transparent, and translucent.

2. I can explain why we can or cannot see in the dark.

​​Success Criteria:

• Lab materials provided

• Glue/tape

• Pen/pencil

• Chromebook

• INB

Today you will need:

​Can you read in the dark?

Poll

Do you think it is possible to read in the dark?

• Yes

• No

Objects must reflect light to be seen.

​How does light interact with different materials?

​ Write the question at the top of the next blank page in your INB. Then tape or glue one square of each medium. Using the given flashlight shine a light on each medium and note what you observe for each one.

​some light passes through

Translucent

​transmits almost all light  absorbing and reflecting little

Transparent

does not allow light to pass through - only absorbs & reflects

Opaque

Match

Match the following

• Opaque

• Transparent

• Translucent

• Reflection

• Visible Light

does not allow light to pass through

transmits almost all light

some light passes through

Light or sound bouncing off an object

found on the electromagnetic spectrum

• does not allow light to pass through

• transmits almost all light

• some light passes through

• Light or sound bouncing off an object

• found on the electromagnetic spectrum

​Law of Reflection

​smooth surface

​rough surface

Occurs when wave of light passes from one medium to another and light wave is bent or refracted

​

Refraction of Light

Bending Light - Snell's Law | Refraction | Reflection - PhET Interactive Simulations

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Open Ended

What is the difference between reflection and refraction?

Match

Match the following

• Diffraction

• Refraction

• Reflection

Bending around an object

Bending as it passes through a medium

Bounces off a medium

• Bending around an object

• Bending as it passes through a medium

• Bounces off a medium

Support your answer using what we have learned today.

Can you read in the dark?

Categorize

Options (6)

Plastic Wrap

Tracing Paper

Transmits most light

Transmits little to no light

Transmits some light

Reflect light to see

Organize these options into the right categories

Transparent

Translucent

Opaque

All objects

Multiple Choice

Which color bends the most through a prism?

• red

• green

• blue

• violet

Multiple Choice

What occurs when parallel rays of light hit a rough or bumpy surface?

• refraction

• regular reflection

• diffuse reflection

• diffraction

Multiple Choice

According to the law of reflection, the angle at which light strikes a surface is _____ the angle at which light is reflected.

• the same as

• less than

• much larger than

• slightly more than

Now it's your turn...

Log into Google Classroom
Work on Slide 2, the left of slide 3 and slide 4 in your digital INB
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Work on your Waves Study Plan