Question

11. A ray of light strikes a thick sheet of glass (n-1.5) at an angle of 25° with the normal. Find the angle of the ray reflected off the glass surface with respect to the normal. a. 56 b.46 c.39 d. 25 12. A fiber optic cable (n- 1.s0o) is submerged in water (- 1.33). What is the critical angle for light to stay inside the cable? 2. 83.1 b.62.5 С. 41.8 d. 27.6 13. An object placed 12 cm from a concave mirror produces a real image 8.0 cm from the mirror. If the object is now moved to a new position 18.0 cm from the mirror, where is the new image located as measured from the mirror? a. 3.0 cm b. 6.5 cm c. 9.2 cm d. 14.6 cm 14. A girl is standing in front of a concave mirror. Consider two rays of light, one from her nose and one from her mouth that are parallel as they are traveling toward the mirror. These rays will come together: a at the focal point. b. at the center of curvature. c at the image point. d. behind the mirror if she is too close to the mirror. 15. An object, located 90 cm from a concave lens, forms an image 60 cm from the lens on the same s as the object. What is the focal length of the lens? a. -36 cm b.-75 cm c.-180 cm d.-150 cm

Answer 1