During the lab, the object, the lens, and the screen where the image forms will

Question

During the lab, the object, the lens, and the screen where the image forms will be mounted on a meter stick. Below is data for the positions (location on the meter stick) of the lens and the image that is formed on the screen. The position of the object is fixed at 3 cm. The object distance is the distance between the object being observed and the lens. The image distance is the distance between the lens and the position of the screen where the image is formed. Image height is negative if image inverted because the image is below the optic (principal) axis. Answer questions 4-8 using your lab manual and the sign conventions listed in the Thin Lenses Notes. Make sure you put positive (+) or negative (-) signs as appropriate based on the sign conventions. I will NOT assume that no sign means positive. Positions ON meter stick of object, lens and screen, and size of object and image Position of object Position of lens Position of screen Size of image Size of object Lenson meter stick on meter stickon meter stick (image height), | (object height), E Can xs (cm) 37.8 (cm) +1.6 cm Xo (cm) n(cm 16.2

Explanation / Answer

4. Object distance= 16.2- 3.0= 13.2cm.

5. Image distance= 37.8-16.2= 21.6cm.

The distances are obviously positive. But the object is on the left of the lens and hence in the negative direction and the image is in the positive direction.

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