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FAQs on PPT: Light: Shadows and Reflections - PPTs for Class 7
| 1. What are shadows and how are they formed? |  |
Ans. Shadows are dark areas that are formed when an opaque object blocks the path of light. When light travels in straight lines and encounters an object, the light cannot pass through, resulting in a shadow on the surface behind the object. The size and shape of the shadow depend on the position of the light source and the distance between the object and the surface where the shadow is cast.
| 2. What factors affect the size and shape of a shadow? | |
Ans. The size and shape of a shadow are influenced by several factors, including the distance between the light source and the object, the distance between the object and the surface where the shadow is formed, and the angle of the light source. For instance, as the distance from the light source increases, the shadow becomes larger and more diffuse, while shadows appear sharper and more defined when the light source is closer to the object.
| 3. What is reflection and how does it occur? | |
Ans. Reflection is the bouncing back of light rays when they strike a smooth and shiny surface, such as a mirror or still water. This phenomenon occurs because light travels in straight lines, and when it encounters a reflective surface, it changes direction while maintaining the angle at which it hit the surface. The law of reflection states that the angle of incidence is equal to the angle of reflection.
| 4. How do we see objects around us in relation to light? | |
Ans. We see objects around us because they either emit their own light or reflect light from other sources. When light from a source, such as the sun or a bulb, hits an object, some of the light is absorbed while the rest is reflected. The reflected light enters our eyes, and our brain interprets this information, allowing us to perceive the object's colour, shape, and texture.
| 5. What is the difference between a shadow and a reflection? | |
Ans. The main difference between a shadow and a reflection lies in their formation and appearance. A shadow is formed when light is blocked by an opaque object, creating a dark area on a surface behind it. In contrast, a reflection occurs when light bounces off a shiny surface, creating an image of the object. Shadows are typically dark and lack detail, whereas reflections can show the colours and shapes of the objects that are being reflected.
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Feb 11, 2026 Last updated
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