Directions: As you review these problems work out each example on your own paper, boxing in your answers as you go. Make sure that you state the formulas and list each problem's givens prior to solving for any requested numerical answers. Although polished rays diagrams are not required, sketches for each situation are recommended. Since this is a demonstration lesson, you may view correct answers as often as necessary to verify that you understand the steps in each problem set. Once all four problems are completed, then you are ready to proceed to your first individual worksheet.
To calculate the location of the image we use the thin lens equation.

Refer to the following information for the next four questions.
When rays from the distant sun pass through a convex lens a bright point image of the sun is cast 0.7 meters behind the lens onto the ground.
Refer to the following information for the next four questions.
A light bulb is placed 300 cm from a convex lens of focal length 50 cm.
Refer to the following information for the next four questions.
A light bulb is placed 300 cm from a convex lens of focal length 500 cm.
