1) 1. What is the main purpose of the experiment? a) a) To demonstrate how to use a candle. b) b) To show that light always travels in a straight line. c) c) To learn how to make a pinhole camera. d) d) To measure the speed of light. 2) 2. According to the experiment, what is the key observation when all the holes in the three cardboard pieces are perfectly aligned with the candle? a) a) The candle flame is not visible. b) b) The candle flame appears blurry. c) c) The candle flame is clearly visible. d) d) The light gets reflected 3) 3. In the first part of the experiment, what happens if you slightly move one of the cardboard pieces out of alignment? a) The candle flame appears brighter. b) b) The candle flame becomes visible from a different angle. c) c) The candle flame is no longer visible. d) d) The light bends around the cardboard. 4) 4. The scientific principle that light travels in a straight line is known as........ a) a) Light refraction. b) b) Light reflection. c) c) Linear propagation of light. d) d) Light dispersion. 5) 5. What material is used in the second part of the experiment to demonstrate the same principle? a) a) A solid metal pipe. b) b) A flexible, bendable pipe. c) c) A transparent glass tube. d) d) A paper towel roll. 6) 6. In the second activity, when is the candle flame visible through the pipe? a) a) When the pipe is bent. b) b) Only when the pipe is made of a transparent material. c) c) When the pipe is perfectly straight. d) d) When the candle is very close to the pipe. 7) 7. What is the main conclusion of the experiment with the bent pipe? a) a) Light can pass through any material. b) b) The light bends with the pipe. c) c) Light travels in a curved path. d) d) Light cannot travel through a bent path. 8) 8. What is the role of the pinholes in the cardboard pieces? a) a) To create a source of light. b) b) To allow a single, straight path for the light to travel. c) c) To magnify the image of the flame. d) d) To color the light 9) 9. Based on the experiment, what is a necessary condition for light to reach the observer's eye from the source? a) a) The medium must be transparent. b) b) The path must be curved. c) c) The path must be a straight line. d) d) The observer must be moving. 10) 10. If the purpose is to see the candle flame through the cardboards, the holes should be aligned. This is a practical example of: a) a) Light reflection. b) b) Light absorption. c) c) Rectilinear propagation of light. d) d) Light interference.

JKC Std VI Experiment 16: Linear Propagation of Light

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