Light: Shadows and Reflections
Short Questions
1. What is a luminous object?
Answer: An object that emits its own light, like the Sun or a firefly.
2.Does the Moon produce its own light?
Answer: No, it reflects sunlight.
3.How does light travel?
Answer: In a straight line.
4.What is a shadow?
Answer: A dark patch formed when an object blocks light.
5.What is a transparent material?
Answer: A material that allows light to pass through completely.
6.What is reflection of light?
Answer: When light bounces off a shiny surface like a mirror.
7.What is lateral inversion?
Answer: When left appears right and right appears left in a mirror.
8.What does a pinhole camera do?
Answer: It forms an upside-down image of an object.
9.What is a periscope used for?
Answer: To see objects that are not directly visible.
10.What creates patterns in a kaleidoscope?
Answer: Reflections from mirrors inside it.
Long Questions
1. Why do opaque objects form darker shadows than translucent objects?
Answer: Opaque objects block light completely, creating a dark shadow. Translucent objects allow some light to pass, making lighter shadows.
2.How can you prove that light travels in a straight line?
Answer: By aligning holes in matchboxes and passing light through them, you see light only when holes are in a straight line. A bent pipe blocks the light, confirming it travels straight.
3.What happens to the image in a plane mirror when you move closer or farther?
Answer: The image appears closer when you are closer to the mirror. It appears farther when you move away.
4. Why is the image in a pinhole camera upside down?
Answer: Light rays from the object cross at the pinhole, flipping the image. This creates an inverted image on the screen.
5. How does a kaleidoscope create different patterns?
Answer: Three mirrors inside reflect objects like beads multiple times. Rotating the kaleidoscope changes the reflections, forming new patterns.
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