Class 6 Science Chapter 8 Question Answers - Light, Shadow and Reflections

Short Answer Type Questions

Q1: What is a luminous object?
Ans: A luminous object is something that produces its own light, like the sun or a lighted candle.

Q2: Why can we see objects on this page?
Ans: We can see objects on this page because the light falling on it reflects back and reaches our eyes, making it illuminated.

Q3: What is solar energy?
Ans: Solar energy is the energy from the sun, which includes both light and heat.

Q4: How does a shadow form?
Ans: A shadow forms when an opaque object blocks light, creating a dark patch on the opposite side.

Q5: Why does a mirror form a clear image?
Ans: A mirror forms a clear image because when light falls on its smooth surface, the reflected rays continue to travel parallel to each other.

Long Answer Type Questions

Q1: Explain the difference between luminous and illuminated objects with examples.
Ans: Luminous objects produce their own light, like the sun, while illuminated objects do not produce light but appear bright because of reflected light, such as the Earth.

Q2: Describe the significance of the sun for life on Earth.
Ans: The sun is crucial as it provides both light and heat energy. Plants use sunlight for photosynthesis, and all living things depend on the food made by plants, sustaining life on Earth.

Q3: Illustrate the process of shadow formation and the conditions required for a visible shadow.
Ans: A shadow forms when an opaque object blocks light. For a visible shadow, we need a luminous source, an opaque object, and a surface to capture the shadow.

Q4: Explain the occurrence of a solar eclipse with a diagram.
Ans: A solar eclipse occurs when the moon comes between the sun and Earth, casting a shadow on specific regions. A total eclipse happens when regions are covered by the full dark shadow of the moon.

Q5: Why does a rough surface not form a clear image, unlike a plane mirror?
Ans: A rough surface scatters reflected light in various directions, preventing the formation of a clear image. In contrast, a plane mirror has a smooth surface, and reflected rays remain parallel, forming a clear image.