1 What causes light waves to refract?A) The speed of light is reduced to zero. B) The speed of light remains constant. C) The light is repelled by some materials. D) The speed of light changes from one medium to the next. 2 What are the primary pigment colors?A) red, orange, yellow, green, blue, indigo, and violet B) black and white C) red, blue, and yellow D) yellow, magenta, and cyan 3 What is special about zoom lenses?A) They have a long focal length. B) They have no focal length. C) They have a short focal length. D) They allow you to change the focal length. 4 A source of light emits light rays __________.A) in a circle B) in all directions C) in a straight line D) only at right angles 5 A blue car looks blue because __________.A) blue light is absorbed while others are reflected B) the blue car emits blue light C) blue light is reflected while others are absorbed D) the blue car is opaque 6 What is a focal length?A) the distance light travels along a reflective surface B) the difference between the angle of incidence and the angle of reflection C) the distance from the center of the mirror to the focal point D) the distance from the mirror to the reflecting object 7 To correct nearsightedness, which lenses should be used?A) concave B) convex C) reflecting D) plane 8 A wave transfers __________.A) gas B) energy C) matter D) liquid 9 Where does an image form on the eye?A) the retina B) the optic nerve C) the cornea D) the lens 10 What type of lenses do microscopes use?A) convex B) plane C) reflecting D) concave 11 What is the main purpose of a telescope?A) to magnify an image B) to gather as much light as possible C) to make objects appear closer D) to reflect light at an object 12 What occurs to light waves in a convex mirror?A) They converge. B) They diverge. C) They reflect at right angles. D) They are absorbed. 13 The speed of light is __________.A) slower in water than in air B) fastest in water C) faster in water than in air D) the same speed in water and air 14 All lenses have __________.A) no curves at all B) only one curved side C) two curved sides D) at least one curved side 15 Object A reflects more than object B. Therefore, object A is __________ object B.A) made of the same material as B) smoother than C) just as smooth as D) rougher than 16 Which is not a primary color?A) red B) yellow C) blue D) green 17 What is called the normal to the surface?A) the line perpendicular to where the light ray strikes the surface B) the reflecting surface itself C) the angle of the incoming beam of light D) the line parallel to a reflecting surface 18 Why can you see most objects?A) light refracts through them B) light reflects off them C) they emit light D) they absorb light 19 The image formed by a concave lens is similar to that formed by a __________.A) convex mirror B) plane mirror C) convex lens D) concave mirror 20 Objects that allow only some light to pass through them are considered __________.A) opaque B) solid C) transparent D) translucent