1) What does this experiment tells us about? a) Transmission of light does not require media. b) Light travels in the same speed across the same medium. c) Light travels in a straight line. 2) Light cannot travel a) in vacuum.  b) in any solid. c) in opaque object. d) in transparent object. 3) Speed of light in vacuum is a) 8 x 103 m/s b) 3 x 108 km/s c) 3 x 105 m/s d) 3 x 105 km/s 4) What is the phenomena shows in the diagram? a) Dispersion of light b) Reflection of light c) Refraction of light 5) What is the phenomena shows in the diagram? a) Reflection of light b) Refraction of light c) Dispersion of light 6) What is reason for the change of refracted ray? a) Change of angle of refraction across different media b) Change of speed of light across different media c) Change of direction of light across different media 7) When light ray move to a denser medium (air to water), the refracted ray will a) bend towards the normal b) bend away from the normal c) bend to different side of the normal 8) Which of the following is NOT the primary color of light? a) Red b) Yellow c) Green d) Blue 9) Magenta = ? + ? a) Red + Green b) Red + Blue c) Blue + Green 10) Green + Red =? a) Magenta b) Cyan c) Yellow d) Violet 11) Which is incorrect about the diagram? a) It is an diffuse reflection. b) It happens when parallel rays fall into irregular(rough) surface. c) The angle of reflection is always equal to angle of incidence. d) Paper and wood surface are some examples with these phenomenon. 12) Which of the following is NOT the characteristics of image formed in plane mirror? a) Same size as the object. b) Same side as the object. c) Laterally inverted d) virtual 13) The image see through a magnifying glass is a) upright, enlarged, virtual b) inverted, enlarged, virtual c) upright, diminished, virtual d) upright and real 14) Which of the following is not a characteristics of an image formed in a plane mirror? a) upright b) inverted c) same size as the object d) virtual 15) Which is not an optical instrument that converges light? a) Convex lens b) Concave lens c) Concave mirror d) convex mirror 16) What does the diagram tells us? a) refraction of light b) Reflection of light c) Dispersion of light d) Light travels in a straight line 17) If you are opening a shop and wish to install a mirror so that you able to see blind corners in the shop. Which mirror do you need? a) convex mirror b) concave mirror c) plane mirror d) rear view mirror 18) An object that reflect green light and blue light but absorbs all other colours. If white light strikes on it, what will be the colour of the object? a) magenta b) yellow c) cyan d) blue 19) The following are the characteristics of image formed on retina except a) virtual b) upright c) diminished d) inverted 20)  Which is not true about the diagram? a) It is a convex mirror. b) It converges light c) The image is virtual, upright and diminished. d) Car rear view mirror is another example of the mirror used. 21) Which is incorrect about the picture? a) It is a diffuse reflection. b) The light rays are scattered in various direction. c) It can be formed when light rays strikes on a smooth surface. d) Wood and paper are one of the examples that create such reflection. 22) What is the phenomenon shown? a) Reflection of light b) refraction of light c) dispersion of light d) total internal reflection 23) Which of the following is not true? a) Angle of reflection is equal to angle of incidence.  b) Angle of refraction is smaller than angle of incidence when light travel through a denser medium.. c) Speed of light will not change when travel across different medium. d) When angle of incidence increases, angle of reflection and angle of refraction increases. 24) When white light travels through a magenta filter, green light being absorbed and magenta is seen. What colour is seen if a blue filter is used? a) red light b) blue light c) magenta light d) white light 25) Which is correct about this? a) This is a convex lens. b) It converges light rays. c) It is used to correct people with near sightedness (myopia). d) It is used to make magnifying glass. 26) Why is the image of plane mirror like this? a) the image has the same size as the object. b) The image is virtual. c) The image is laterally inverted. d) The image is upright. 27) Which is true about the total internal reflection? a) Both refracted ray and reflected ray disappear at once. b) Refracted ray disappear and reflected ray is formed. c) all the light being refracted by the glass. d) It happens when the angle of incidence is smaller than the critical angle. 28) Which is true about the diagram? a) Light travels to a denser medium. b) Refracted ray bends towards the normal. c) The speed of light increase as it travels from glass to air.  d) The angle of refraction(r) is smaller than the angle of incidence(i). 29) If the 3 blocks are placed under red light, predict your observations 观察. a) red circle, red triangle and red square. b) Blue circle, red triangle and red square. c) Black circle, red triangle and red square. d) Blue circle, green triangle and black square. 30) The colour of the object we can see is the colour that the object...  a) absorbs b) reflects c) refracts d) releases

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