Convex and Concave Lenses

PREDICT!

• Predict: What will happen to the light as it goes through the CONCAVE lens?

• What will happen to light as it goes through a CONVEX lens?

• Draw a picture!

Observe:

• Supplies: – Convex Lens (draw / label it)– Concave Lens– Flashlight

• Draw what happens as light goes through each lens. Did it match your prediction?

Explain!!

• Why does this happen?• Is it reflection? Refraction? Both?

LABEL YOUR DIAGRAM!!!

Concave Lens!

Notes: Focal Point:The point where the refracted light rays converge. Where is it?

Convex Lens: Where is the Focal Point?

Focal Point!

Concave Lens: Is there a Focal Point?

Questions to answer:

1. What’s the difference between a LENS and a MIRROR?

2. What’s the difference between a CONVEX and CONCAVE lens?

3. Explain WHY your reflection is upside-down in a CONCAVE MIRROR (draw a picture).

Compound Lenses

• ON THE BACK OF YOUR PAPER; Draw a diagram of a compound lens.

• Predict: What happens as light goes through it?

• Observe: What really happened?

• What’s an example of a compound lens?

Lenticular lenses: Used on special TV screens. What do they do?

Lenses and Technology! 3D without glasses!

Convex and Concave Mirrors!

• Look at your reflection in both sides of the mirror.

• What does your reflection look like?

• Why does this happen? – More details tomorrow!