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Very short answer type questions.
A. Give two examples of the following.
1. Man-made sources of light
2. Opaque materials
3. Objects that can form a shadow
4. Irregular surfaces (with respect to reflection)
5. Regular surfaces (with respect to reflection)
3. Define the following terms.
Answers
Answer:
1. Torch, bulb
2. wood
3. opaque object
Answer:
Question 1:
Give two examples each of natural and artificial sources of light.
ANSWER:
Natural sources of light are found in nature and are capable of emitting visible light.
Example: Sun and moon
Artificial sources of light are man-made sources of light.
Example: Candle and electric bulb
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Question 2:
What are 'rays' and 'beams'? Represent them diagrammatically.
ANSWER:
Ray:
A ray is just a single ray of light and is shown by an arrow.
Beam:
Beam is a bunch of parallel rays of light.
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Question 3:
List the conditions needed for a shadow to form.
ANSWER:
Following conditions are needed for the formation of a shadow:
1. A light source
2. An opaque obstacle
3. A screen
4. Umbra (darkest part of the shadow) must fall on the screen.
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Question 4:
List three characteristics of a shadow.
ANSWER:
Characteristics of a shadow:
1. It is always black, regardless of the colour of the object used to make the shadow.
2. It only shows the shape or outline of the object and not the details.
3. The size of a shadow varies depending on the distance between the object and the source of light and the distance between the object and the screen.
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Question 5:
What do you understand by diffused reflection?
ANSWER:
Diffused reflection:
When light rays fall on rough surfaces, the reflected rays will travel in different directions. This type of reflection is known as irregular or diffused reflection. The diffused reflection does not obey the laws of reflection
Step-by-step explanation:
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