Class 10 Exam > Class 10 Questions > If a lens has a focal length, F = +12 cm, the...
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If a lens has a focal length, F = +12 cm, then it is a
- a)Can be convex or concave
- b)Convex lens
- c)Diverging lens
- d)Concave lens
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
If a lens has a focal length, F = +12 cm, then it is aa)Can be convex ...
The focal length of convex lens is always positive. Image obtained can be either real or virtual.
Most Upvoted Answer
If a lens has a focal length, F = +12 cm, then it is aa)Can be convex ...
Explanation:
A lens is a transparent material that refracts light to converge or diverge it. Lenses are classified into two types: convex and concave lenses.
- Convex lens: A convex lens is thicker in the middle and thinner at the edges. When light rays pass through a convex lens, they converge at a point on the other side of the lens known as the focal point. The distance between the lens and the focal point is known as the focal length (F). A convex lens is also known as a converging lens because it converges light rays.
- Concave lens: A concave lens is thinner in the middle and thicker at the edges. When light rays pass through a concave lens, they diverge and do not meet at a focal point. A concave lens is also known as a diverging lens because it diverges light rays.
In this question, the given focal length (F) of the lens is 12 cm. Based on this information, we can conclude that the lens in question is a:
- Convex lens: Since the focal length (F) is positive, the lens must be a convex lens. A concave lens has a negative focal length.
Therefore, the correct answer is option 'B' - Convex lens.
A lens is a transparent material that refracts light to converge or diverge it. Lenses are classified into two types: convex and concave lenses.
- Convex lens: A convex lens is thicker in the middle and thinner at the edges. When light rays pass through a convex lens, they converge at a point on the other side of the lens known as the focal point. The distance between the lens and the focal point is known as the focal length (F). A convex lens is also known as a converging lens because it converges light rays.
- Concave lens: A concave lens is thinner in the middle and thicker at the edges. When light rays pass through a concave lens, they diverge and do not meet at a focal point. A concave lens is also known as a diverging lens because it diverges light rays.
In this question, the given focal length (F) of the lens is 12 cm. Based on this information, we can conclude that the lens in question is a:
- Convex lens: Since the focal length (F) is positive, the lens must be a convex lens. A concave lens has a negative focal length.
Therefore, the correct answer is option 'B' - Convex lens.
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Community Answer
If a lens has a focal length, F = +12 cm, then it is aa)Can be convex ...
From the sign convention, the focal length of convex lens is positive. So, option B is correct.
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If a lens has a focal length, F = +12 cm, then it is aa)Can be convex or concaveb)Convex lensc)Diverging lensd)Concave lensCorrect answer is option 'B'. Can you explain this answer?
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