Question

Worksheet 2 - Phys 231 - Optical Instruments 3. You can make a simple cell phone projector with a plane mirror angled at 45°, and a lens, to project images onto a screen. The diagram shows the locations of the mirror, a lens, and an arrow that represents the object which is a picture on you cell phone. Scale : O mark= 10cm (a) Show the image of the arrow in the mirror. (b) Find the focal length. f. of the lens needed so the image of the arrow is sharply focused on the screen. (c) What approximately is the magnification of the final image? (d) You can improve the design of your cell phone projector by making the distance from your cell phone to the mirror adjustable. What properties of the image change when you change this distance? Why is this adjustment useful? Explain.

Answer 1

Answer la plane mirror (lend) Yocm --- Szoom i screen (6) Now we need to calculate focal length, f Śs on solving o.171 m t = 17.1cm a or t = 17.1cm c) magnification, M Š M=0.75 when the distance between cell phone and mirror is change, then's is also changes. So magnification will changes as inversely proportional