16. Which of these properties of light is a constant? 20. What is the magnification in Question 19? c. frequency wavelength d. amplitude speed in a vacuum 16. 17. Materials that do not allow any transmission of light are described as c. opaque transparent d. luminous translucent 20. 17 . 21. What is the focal length of the mirror in Question 19? 18. The phenomenon that results from light waves being bent by an edge is 19. A 1. 1-m tall child is standing 6.0 m from a spherical convex mirror. The child's image is 0.40 m behind the mirror. What is the image height? Draw a diagram. 22. Which surface would produce specular reflection of light? white construction paper C. a piece of black cloth a telescope mirror d. a concrete sidewalk