Class 10 Exam > Class 10 Questions > A lens has a power of +0.5 D. It isa)a concav...
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A lens has a power of +0.5 D. It is
- a)a concave lens of focal length 5 m
- b)a convex lens of focal length 5 cm
- c)a convex lens of focal length 2 m
- d)a concave lens of focal length 2 m
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
A lens has a power of +0.5 D. It isa)a concave lens of focal length 5 ...
F=1/p
=1/0.5
=10/5
=2 cm
here the focal length is +ive hence it is a convex lens and option (c) is correct
=1/0.5
=10/5
=2 cm
here the focal length is +ive hence it is a convex lens and option (c) is correct
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Community Answer
A lens has a power of +0.5 D. It isa)a concave lens of focal length 5 ...
Explanation:
Given information:
A lens has a power of +0.5 D.
Understanding lens power:
The power of a lens is defined as the reciprocal of its focal length in meters. It is measured in diopters (D). Therefore, the formula for power (P) in diopters is:
\[ P = \frac{1}{f} \]
Where:
P = Power of the lens in diopters
f = Focal length of the lens in meters
Calculation:
Given power of the lens (P) = +0.5 D
Using the formula, we can rearrange it to find the focal length (f):
\[ f = \frac{1}{P} \]
\[ f = \frac{1}{0.5} \]
\[ f = 2 \, meters \]
Conclusion:
Therefore, the lens with a power of +0.5 D is a convex lens with a focal length of 2 meters.
Given information:
A lens has a power of +0.5 D.
Understanding lens power:
The power of a lens is defined as the reciprocal of its focal length in meters. It is measured in diopters (D). Therefore, the formula for power (P) in diopters is:
\[ P = \frac{1}{f} \]
Where:
P = Power of the lens in diopters
f = Focal length of the lens in meters
Calculation:
Given power of the lens (P) = +0.5 D
Using the formula, we can rearrange it to find the focal length (f):
\[ f = \frac{1}{P} \]
\[ f = \frac{1}{0.5} \]
\[ f = 2 \, meters \]
Conclusion:
Therefore, the lens with a power of +0.5 D is a convex lens with a focal length of 2 meters.
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A lens has a power of +0.5 D. It isa)a concave lens of focal length 5 mb)a convex lens of focal length 5 cmc)a convex lens of focal length 2 md)a concave lens of focal length 2 mCorrect answer is option 'C'. Can you explain this answer?
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ample number of questions to practice A lens has a power of +0.5 D. It isa)a concave lens of focal length 5 mb)a convex lens of focal length 5 cmc)a convex lens of focal length 2 md)a concave lens of focal length 2 mCorrect answer is option 'C'. Can you explain this answer? tests, examples and also practice Class 10 tests.
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