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Important questions based on NCERT syllabus for Chapter 11 - Light, Shadows and Reflections:
Question-1: What do you mean by opaque, transparent and translucent objects? Give one example for each of them.
Solution: When an object does not let the light pass through it then the object is known as opaque. We cannot see through them. For example Wall. If you are able to see clearly through an object, it is allowing light to pass through it and is transparent. Example: Air, glass. There are some objects through which we can see, but not very clearly. Such objects are known as translucent. For example: Wet glass.
Question-2: Why our shadows formed in the morning and evening are bigger than shadows formed in the noon?
Solution: Shadows are formed when an object is placed in the path of light and that object do not let light to pass through it and shadow is formed on the opposite side of the object. During morning and evening, the incident angle of the light is very small. Due to this, longer shadows are formed in the morning and evening than the noon.
Question-3: Why do opaque objects cast a shadow, while transparent and translucent objects don’t?
Solution: Opaque objects cast shadows because they do not let light pass through them. Hence, they form a dark patch on the other side of the object. Transparent and translucent objects do not cast shadows because they let light pass through them. Hence, they don’t form any dark patch.