What is the speed of light in air approximately?

Which part of the eye helps us focus light?

Which of these surfaces reflects light best?

Which one is an example of a translucent object?

What causes the sound we hear?

In which medium does sound travel fastest?

What is an echo?

Which color of light bends the most when passing through a prism?

Which tool is used to see sound waves?

What type of lens is used in a magnifying glass?