Estimate the magnification and focal length of the pitcher of water shown in the figure below. (Assume that the tree is about 46 ft tall and its inverted image is about 1 foot tall. Also assume that the tree is about 290 ft from the pitcher. Include the sign of the value in your answers.) magnification focal length ft Elizabeth Owens/American Association of Physics Teachers

Draw the figure shown abov onto the same page as the mathematical proofs of your answer. Using the upright arrow as your object, draw the three primary light rays (M-, F-, and P-rays) to determine where the image will be located. Finally draw in the image taking care to show the correct size and orientation of the image. The black dots in the diagram represent the focal points of the lens.

Draw using a ray diagram, locate the image of an object and what is its characteristics.

Question 3 Below is a scale drawing of a lens with a focal length f = 15 cm with an object located a distance d, = 20 cm to the left of the lens. The circles mark the locations of the focal points, 15 cm to either side of the lens. In the next activity you will set up an object 20 cm from a 15 cm focal length lens, and locate the position at which the image is formed. Make a ray diagram for this situation, following the steps given in Activity 1.2. Use the ray diagram to determine the distance from the lens to the image that will be formed. Object 1