A person looks at his reflection in the concave side of a shiny spoon. Is it right side up or inverted? Does it matter how far his face is from the spoon? What if he looks in the convex side?

You take a lens and mask it so that light can pass through only the bottom half of the lens. How does the image formed by the masked lens compare to the image formed before masking?

The image of a tree just covers the length of a plane mirror 4cm tall when the mirror is held 35cm from the eye. The tree is 28m from the mirror. What is its height?

A coin is placed next to the convex side of a thin spherical glass shell having radius of curvature 18.0cm. Reflection from the surface of the shell forms an image of the 1.5cm tall coin that is 6.0cm behind the glass shell. Where is the coin located? Determine the size, orientation, and nature (real or virtual) of the image.

An object to the left a lens produces an image on a screen 30cm to the right of the lens. When the lens is moved 4cm to the right, the screen must be moved 4cm to the left to refocus the image. What is the focal length of the lens?