A near-sighted student can't see objects beyond 50 cm clearly (his far point). An optometrist prescribed new glasses for him. 12 a) What is the type of the lens the optometrist will prescribe? b) Calculate the focal length and the power of the new glasses.

1. What is the focal length of a makeup mirror that produces a magnification of 1.51 when a person's face is 12.2 cm away? Think & Prepare: 1. What kind of mirror causes magnification? 2. What kind of image is it? 3. What signs will the different quantities have? (a) Set-up the table for some known quantities. i) Make sure to use the correct sign for the image distances, object distances, and the focal lengths. ii) Make sure to use the correct sign for the image and object heights. Inverted object and image heights are negative. iii) Do NOT do any calculations for this section. do = V cm M= (b) What is the focal length? f = cm

5. A convex lens forms an image of a soda can. The image is 2 cm tall and appears 8 cm from the lens. The height of the soda can is 10 cm. (a) Include a drawing/ray diagram of this setup, (b) Where is the can located (object distance) and (c) what is the focal point of this lens?

A. Calculate the focal length of the mirror formed by the convex side of a shiny spoon that has a 1.67 cm radius of curvature. B. What is its power in diopters?