Understanding Refraction and Disappearing Test Tubes

What happens to light when it moves from canola oil to Pyrex glass?

• It stops completely.

• It speeds up significantly.

• It bends due to a change in medium.

• It changes color.

Why does the test tube seem to disappear when filled with canola oil?

• The test tube is removed from the cup.

• The canola oil and Pyrex glass have the same index of refraction.

• The test tube is painted with a special coating.

• The light is turned off.

What is the significance of having the same index of refraction for two materials?

• Light travels at different speeds through them.

• Light bends more when passing through them.

• Light travels at the same speed through them.

• Light is absorbed completely by them.