Railways Exam > Railways Questions > Dioptre is the unit of:a)Power of a lensb)Fo...
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Dioptre is the unit of:
- a)Power of a lens
- b)Focal length of a lens
- c)Light intensity
- d)Sound intensity
Correct answer is option 'A'. Can you explain this answer?
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Dioptre is the unit of:a)Power of a lensb)Focal length of a lensc)Lig...
Dioptre is the unit of Power of a lens.
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Dioptre is the unit of:a)Power of a lensb)Focal length of a lensc)Lig...
Understanding Dioptre
Dioptre is a crucial unit in optics that specifically measures the power of a lens.
What is Power of a Lens?
- The power of a lens indicates its ability to converge or diverge light.
- It is defined as the reciprocal of the focal length (in meters) of the lens.
Unit Measurement
- The unit of power is expressed in dioptres (D).
- For example, a lens with a focal length of 0.5 meters has a power of +2 dioptres (1/0.5).
Significance of Dioptre
- Positive dioptre values indicate converging (convex) lenses, which are used to correct farsightedness.
- Negative dioptre values indicate diverging (concave) lenses, used to correct nearsightedness.
Other Options Explained
- Focal Length of a Lens: Measured in meters, not dioptres.
- Light Intensity: Measured in lumens or watts, not related to dioptres.
- Sound Intensity: Measured in decibels, not applicable to optics.
Conclusion
- Dioptre specifically refers to the power of a lens and is vital in optical applications. Understanding this concept is essential for anyone studying physics, particularly in the area of optics.
Dioptre is a crucial unit in optics that specifically measures the power of a lens.
What is Power of a Lens?
- The power of a lens indicates its ability to converge or diverge light.
- It is defined as the reciprocal of the focal length (in meters) of the lens.
Unit Measurement
- The unit of power is expressed in dioptres (D).
- For example, a lens with a focal length of 0.5 meters has a power of +2 dioptres (1/0.5).
Significance of Dioptre
- Positive dioptre values indicate converging (convex) lenses, which are used to correct farsightedness.
- Negative dioptre values indicate diverging (concave) lenses, used to correct nearsightedness.
Other Options Explained
- Focal Length of a Lens: Measured in meters, not dioptres.
- Light Intensity: Measured in lumens or watts, not related to dioptres.
- Sound Intensity: Measured in decibels, not applicable to optics.
Conclusion
- Dioptre specifically refers to the power of a lens and is vital in optical applications. Understanding this concept is essential for anyone studying physics, particularly in the area of optics.
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Dioptre is the unit of:a)Power of a lensb)Focal length of a lensc)Light intensityd)Sound intensityCorrect answer is option 'A'. Can you explain this answer?
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