Here are 10 one-word answer type questions from the topic Images Formed by Lenses with their answers and explanations:
Topic: Images Formed by Lenses
Lenses are transparent objects which bend light rays. There are two types of lenses – convex lens and concave lens. They form different kinds of images depending on the position of the object.
1. Question: Which lens is thicker in the middle and thinner at the edges?
Answer: Convex
Explanation: A convex lens is thicker in the middle and thinner at the edges.
2. Question: Which lens is thinner in the middle and thicker at the edges?
Answer: Concave
Explanation: A concave lens is thinner in the middle and thicker at the edges.
3. Question: What is the image formed by a convex lens when the object is placed very close to it?
Answer: Virtual
Explanation: When an object is very close to a convex lens, it forms a virtual, erect, and magnified image.
4. Question: What is the image formed by a concave lens?
Answer: Virtual
Explanation: A concave lens always forms a virtual, erect, and smaller image.
5. Question: What kind of lens is used as a magnifying glass?
Answer: Convex
Explanation: A convex lens is used in magnifying glasses to produce a magnified image.
6. Question: Which lens is called a converging lens?
Answer: Convex
Explanation: A convex lens bends light rays inwards and is called a converging lens.
7. Question: Which lens is called a diverging lens?
Answer: Concave
Explanation: A concave lens bends light rays outwards and is called a diverging lens.
8. Question: What type of image is formed by a convex lens when the object is far away?
Answer: Real
Explanation: A convex lens forms a real and inverted image when the object is far away.
9. Question: What is the shape of a concave lens?
Answer: Diverging
Explanation: A concave lens diverges light rays and has a diverging shape.
10. Question: What is the position of the image formed by a convex lens when used as a magnifying glass?
Answer: Same side
Explanation: The virtual image formed by a convex lens when used as a magnifying glass is on the same side as the object.
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