Question

Last/First Name (print): PHYS 2240-Section Usename ID sppy Experiment 1: Focal Length of a Lens and a Mirror Not re: Be certain to read the whole experiment to answer these questions. Pre-lab, Part A 1. During the first part of this lab, we want to determine how the object distance is related to what two quantities? 2. How will a convex lens change the image of an object? Explain your answer Pre-lab, Part B 3. Name two examples of spherical mirrors that we will use in our experiment.

Answer 1

Part A: - BY using lens formula if we know the object distance we can find image distance. i.e 1/v - 1/u = 1/f v = Image distance u = Object distance f = focal length If object is at infinity, image is formed at focus and it is diminished, real and inverted If object is at u = 2f, image is formed at v = 2f and is real, inverted and of same size of object If object is at focus u = f, image is formed at infinity and is real inverted, magnified Part B Concave mirror, convex mirror are used in this experiment. From mirror formula 1/v + 1/u = 1/f = 2/R for any position of object (u is -ve) image is always formed behind the mirror (v is + ve) so image is called virtual and Errect (upright)