Let's solve the problems step by step and explain each answer.
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1. Light travels in ______ lines.
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Answer: straight
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Explanation: Light travels in straight lines, which is why we can represent it using rays in diagrams. This property is fundamental to understanding how light behaves when it interacts with objects.
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2. ______ is when light bounces off an object.
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Answer: Reflection
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Explanation: When light hits a surface and bounces back, it is called reflection. This is a key concept in optics.
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3. Light reflects from a smooth surface (mirror, glass, polished metal) at the ______ angle as it hits the surface.
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Answer: same
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Explanation: For smooth surfaces, the angle of incidence (the angle at which light hits the surface) is equal to the angle of reflection (the angle at which light bounces off). This is known as the law of reflection.
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4. For a smooth surface, reflected light rays travel in the ______ direction.
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Answer: same
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Explanation: On a smooth surface, all reflected light rays travel in a single, predictable direction because the surface is uniform. This is why mirrors produce clear reflections.
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5. For a rough surface (leather, stone, fabric), reflected light rays scatter in ______ directions.
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Answer: different
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Explanation: Rough surfaces have irregularities that cause light to reflect in multiple directions. This scattering effect results in diffuse reflection, which is why these surfaces do not produce sharp images.
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6. Which diagram shows a smooth surface?
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Diagram A shows parallel reflected rays, indicating a smooth surface.
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Diagram B shows scattered reflected rays, indicating a rough surface.
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Answer: Diagram A
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Explanation: A smooth surface reflects light in a consistent, parallel manner, as shown in Diagram A. In contrast, a rough surface scatters light in various directions, as shown in Diagram B.
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7. Light intensity is measured with a device called a ______.
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Answer: lux meter or photometer
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Explanation: A lux meter or photometer is used to measure the intensity of light in units such as lux or lumens per square meter.
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8. Give an example of a dim light.
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Answer: Candlelight
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Explanation: Candlelight is a classic example of dim light because it produces a relatively low level of illumination compared to other light sources like lamps or sunlight.
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9. Give an example of a bright light.
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Answer: Sunlight
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Explanation: Sunlight is one of the brightest natural light sources, providing high-intensity illumination.
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Final Answers:
1.
straight
2.
Reflection
3.
same
4.
same
5.
different
6.
Diagram A
7.
lux meter or photometer
8.
Candlelight
9.
Sunlight
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Boxed Final Answer:
\[
\boxed{
\text{1. straight, 2. Reflection, 3. same, 4. same, 5. different, 6. Diagram A, 7. lux meter or photometer, 8. Candlelight, 9. Sunlight}
}
\]
Parent Tip: Review the logic above to help your child master the concept of reflection of light worksheet.
