Light: Shadows and Reflections

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Luminous objects are objects that emit their own light. Examples include: Sun, stars, fireflies, lightning, electric bulbs, and fire. The Sun is the main source of natural light on Earth.

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Non-luminous objects do not emit their own light. We can see the Moon at night because it reflects the light from the Sun that falls on it. The Moon is a non-luminous object that appears bright due to

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Light travels in a straight line. This can be demonstrated by the matchbox activity where light passes through holes only when they are aligned in a straight line, or by observing that we cannot see a

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Transparent materials: Light passes almost completely through them (e.g., clear glass). Translucent materials: Light passes partially through them (e.g., tracing paper). Opaque materials: Light does n

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A shadow is a dark patch formed when an opaque object blocks light. To observe a shadow, we need: 1) A source of light, 2) An opaque object, and 3) A screen (wall, floor, or any surface).

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Opaque objects form darker, well-defined shadows. Translucent objects make lighter, less defined shadows. Some transparent objects can create very faint shadows. The darkness of the shadow depends on

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When the object moves closer to the light source (and farther from the screen), the shadow becomes larger. When the object moves closer to the screen (and farther from the light source), the shadow be

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No, changing the color of opaque objects does not change the color of their shadows. Shadows are always dark because they are regions where light is blocked, regardless of the object's color. The shad