Physics 432

Physics 432LightName___________________REFLECTION & MIRRORS QUIZ1. An object is placed beyond the focal point of a curved mirror as shown. What is trueof the image that is produced?a) real, inverted, and largerb) virtual, inverted, and largerc) real, upright, and smaller fd) virtual, upright, and smaller2. Which of the following is NOT true for mirrors?a) the angle of incidence = the angle of reflectionb) an object placed 20 cm in front of a flat mirror will produce an image 20 cm awayc) the images produced for all mirrors are always upright and virtuald) none of the above3. An object is placed within the focal point of a convex mirror. What is true of theimage produced?a) real, inverted, and largerb) virtual, inverted, and largerc) real, upright, and smallerd) virtual, upright, and smaller3. Circle all of the people that can be seen in the mirror below by person C.A B C D EFG4. A strawberry is placed under a magenta light. What color will you see?a) magenta b) red c) blue d) black e) yellow

5. Draw a ray diagram for the picture below.f6. Draw an accurate reflection of the object in the mirror below. At a minimum, draw aray from the tip of the arrow, the dot and the x as points of reference.7. A light wave has a wavelength of 650,000 micrometers. What is the frequency of thislight wave?c = 3 x 10 8 m/s = 6.5 x 10 5 x 10 -6 m = 6.5 x 10 -1 m f =f = c/ = 3 x 10 8 m/s / 6.5 x 10 -1 m = 4.6 x 10 8 hz

8. You are listening to the Cubs on WGN radio 720 Khz on your AM dial. What is thewavelength of this radio wave? As you pass through the tunnel at the merge with theEdens expressway you lose your radio reception. Explain why this has just occurred?c = 3 x 10 8 m/s f = 720 x 10 3 hz == c/f = 3 x 10 8 m/s / 720 x 10 3 hz = 4.16 x 10 2 m = 416 mThe wavelength of this wave is so much larger than the opening of the tunnel that it can’tbend ( diffract) into the tunnel, so you lose your reception ( no wave is present) in thetunnel.9. A 10 cm tall object if placed 12 cm. in front of a concave mirror with a focal length of8 cm. Determine the size, location, orientation and type of the image that is produced.Draw a mirror ray diagram for this situation on the principal axis below..