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The values of f and u for a concave lens are always
- a)Sometimes negative sometimes positive
- b)Positive
- c)Negative
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
The values of f and u for a concave lens are alwaysa)Sometimes negativ...
Explanation:
A concave lens is a lens that is thinner in the middle and thicker at the edges. It is also known as a diverging lens because it causes parallel rays of light to diverge or spread out.
Sign Convention:
When dealing with lenses, we use a sign convention to determine the sign of various parameters. In this convention:
- Distances are measured from the lens towards the object as positive and away from the lens as negative.
- Heights are measured upward as positive and downward as negative.
- Focal length (f) is positive for a concave lens.
Focal Length (f):
The focal length of a lens is the distance between the lens and the point where parallel rays of light converge or appear to converge. For a concave lens, the focal length is always negative. This is because the rays of light diverge after passing through the lens. Therefore, option A (Sometimes negative sometimes positive) is incorrect.
Image Distance (u):
The image distance (u) is the distance between the lens and the location of the image formed by the lens. For a concave lens, the image distance is always negative. This is because the image formed by a concave lens is always virtual, upright, and located on the same side as the object. Therefore, option C (Negative) is correct.
Conclusion:
In conclusion, the values of f (focal length) and u (image distance) for a concave lens are always negative. Therefore, the correct answer is option B (Positive) is incorrect.
A concave lens is a lens that is thinner in the middle and thicker at the edges. It is also known as a diverging lens because it causes parallel rays of light to diverge or spread out.
Sign Convention:
When dealing with lenses, we use a sign convention to determine the sign of various parameters. In this convention:
- Distances are measured from the lens towards the object as positive and away from the lens as negative.
- Heights are measured upward as positive and downward as negative.
- Focal length (f) is positive for a concave lens.
Focal Length (f):
The focal length of a lens is the distance between the lens and the point where parallel rays of light converge or appear to converge. For a concave lens, the focal length is always negative. This is because the rays of light diverge after passing through the lens. Therefore, option A (Sometimes negative sometimes positive) is incorrect.
Image Distance (u):
The image distance (u) is the distance between the lens and the location of the image formed by the lens. For a concave lens, the image distance is always negative. This is because the image formed by a concave lens is always virtual, upright, and located on the same side as the object. Therefore, option C (Negative) is correct.
Conclusion:
In conclusion, the values of f (focal length) and u (image distance) for a concave lens are always negative. Therefore, the correct answer is option B (Positive) is incorrect.
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Community Answer
The values of f and u for a concave lens are alwaysa)Sometimes negativ...
Answer:
Introduction:
In optics, a concave lens is a lens that is thinner at the center and thicker at the edges. It is also known as a diverging lens as it diverges the incident light rays. The values of f (focal length) and u (object distance) for a concave lens have certain characteristics that are always true.
Explanation:
The values of f and u for a concave lens are always positive. Let's understand why:
1. Focal length (f):
The focal length of a lens is the distance between the lens and its focal point. For a concave lens, the focal length is always negative. This is because the focal point of a concave lens is virtual and located on the same side as the object. The negative sign indicates that the focal point is on the opposite side of the lens compared to the incident light rays.
2. Object distance (u):
The object distance is the distance between the lens and the object. For a concave lens, the object distance is always positive. This is because the object is located on the same side as the incident light rays.
Conclusion:
The values of f and u for a concave lens are always positive. Therefore, the correct answer is option 'b' - Positive.
Introduction:
In optics, a concave lens is a lens that is thinner at the center and thicker at the edges. It is also known as a diverging lens as it diverges the incident light rays. The values of f (focal length) and u (object distance) for a concave lens have certain characteristics that are always true.
Explanation:
The values of f and u for a concave lens are always positive. Let's understand why:
1. Focal length (f):
The focal length of a lens is the distance between the lens and its focal point. For a concave lens, the focal length is always negative. This is because the focal point of a concave lens is virtual and located on the same side as the object. The negative sign indicates that the focal point is on the opposite side of the lens compared to the incident light rays.
2. Object distance (u):
The object distance is the distance between the lens and the object. For a concave lens, the object distance is always positive. This is because the object is located on the same side as the incident light rays.
Conclusion:
The values of f and u for a concave lens are always positive. Therefore, the correct answer is option 'b' - Positive.
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