1) What is a light year? a) A unit of time b) A unit of distance c) A unit of speed d) A unit of energy 2) 1.Which of the following is NOT the property of light? a) ) Light travels in straight lines b) ) Light can be reflected c) Light can bend d) Light is a form of matter 3) What is an optical device? a) A device that uses sound b) A device that uses light c) A device that uses electricity d) A device that uses magnetism 4) What type of telescope uses two lenses? a) Reflecting telescope b) Refracting telescope c) Radio telescope d) Space telescope 5) What is the main function of the objective lens in a refracting telescope? a) To gather light and focus the rays b) To reflect light c) To magnify the image d) ) To direct light to the eyepiece 6) What is a glare? a) Light absorbed by a surface b) Light transmitted through a surface c) Light reflected from a surface d) Light refracted through a surface 7) What happens to the light when it strikes to a transparent material? a) It is absorbed b) It is reflected c) It is transmitted d) It is scattered 8) Which material allows some material to pass through them? a) Transparent b) Translucent c) Opaque d) Reflective 9) What is the term for the materials that do not allow any light to pass through them. a) Transparent b) Translucent c) Opaque d) Reflective 10) What type of reflection occurs when light rays hit a smooth surface? a) Diffuse reflection b) Regular reflection c) Scattered reflection d) Absorbed reflection 11) What is the angle between the incident ray and the normal called? a) Angle of reflection b) Angle of incidence c) Angle of refraction d) Angle of transmission 12) What type of mirror has surface inward like a bowl? a) Convex mirror b) Plane mirror c) Concave mirror d) Cylindrical mirror 13) What happens to the image formed by a concave mirror when the object is far from the focal point? a) The image is upright and enlarged b) The image is upside-down and smaller c) The image is upside-down and larger d) The image is upright and smaller 14) What type of mirror spread out light rays? a) Concave mirror b) Plane mirror c) Convex mirror d) Cylindrical mirror 15) What warning is often found on the convex mirrors of cars? a) "Objects in mirror are larger than they appear" b) "Objects in mirror are closer than they appear" c) "Objects in mirror are smaller than they appear" d) "Objects in mirror are farther than they appear"

Light and Optical System

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