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In a simple microscope, _______.
- a)a lens with negative power is used
- b)the focal length of the lens is less than the least distance for clear vision
- c)the focal length of the lens is greater than the least distance for clear vision
- d)magnification depends only on the focal length of the lens
Correct answer is option 'B'. Can you explain this answer?
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In a simple microscope, _______.a)a lens with negative power is usedb)...
Introduction:
A simple microscope is an optical instrument that is used to magnify small objects or details of objects that are otherwise difficult to see with the naked eye. It consists of a single convex lens that is used to produce a magnified virtual image of the object.
Explanation:
The correct answer is option B, which states that the focal length of the lens is less than the least distance for clear vision. Let's understand why this is the correct answer.
1. Function of a Simple Microscope:
A simple microscope works on the principle of magnification. When an object is placed close to a convex lens, a magnified virtual image is formed on the same side as the object. This virtual image can be seen by the eye, and it appears larger than the object itself.
2. Least Distance for Clear Vision:
The least distance for clear vision, also known as the near point, is the minimum distance at which the eye can focus on an object without strain. In a normal human eye, the near point is approximately 25 cm.
3. Magnification and Focusing:
The magnification of a simple microscope is given by the formula:
Magnification = (25 cm / Least Distance for Clear Vision)
To achieve a higher magnification, the focal length of the lens should be smaller than the least distance for clear vision. This is because a smaller focal length allows the lens to bring the virtual image closer to the eye, resulting in a larger apparent size of the object.
4. Incorrect Options:
a) Option A states that a lens with negative power is used in a simple microscope. This is incorrect because a convex lens with positive power is used to magnify the object.
c) Option C states that the focal length of the lens is greater than the least distance for clear vision. This is incorrect because a larger focal length would result in a smaller magnification.
d) Option D states that magnification depends only on the focal length of the lens. This is incorrect because magnification also depends on the distance of the object from the lens.
Conclusion:
In a simple microscope, the focal length of the lens is less than the least distance for clear vision. This allows for higher magnification by bringing the virtual image closer to the eye.
A simple microscope is an optical instrument that is used to magnify small objects or details of objects that are otherwise difficult to see with the naked eye. It consists of a single convex lens that is used to produce a magnified virtual image of the object.
Explanation:
The correct answer is option B, which states that the focal length of the lens is less than the least distance for clear vision. Let's understand why this is the correct answer.
1. Function of a Simple Microscope:
A simple microscope works on the principle of magnification. When an object is placed close to a convex lens, a magnified virtual image is formed on the same side as the object. This virtual image can be seen by the eye, and it appears larger than the object itself.
2. Least Distance for Clear Vision:
The least distance for clear vision, also known as the near point, is the minimum distance at which the eye can focus on an object without strain. In a normal human eye, the near point is approximately 25 cm.
3. Magnification and Focusing:
The magnification of a simple microscope is given by the formula:
Magnification = (25 cm / Least Distance for Clear Vision)
To achieve a higher magnification, the focal length of the lens should be smaller than the least distance for clear vision. This is because a smaller focal length allows the lens to bring the virtual image closer to the eye, resulting in a larger apparent size of the object.
4. Incorrect Options:
a) Option A states that a lens with negative power is used in a simple microscope. This is incorrect because a convex lens with positive power is used to magnify the object.
c) Option C states that the focal length of the lens is greater than the least distance for clear vision. This is incorrect because a larger focal length would result in a smaller magnification.
d) Option D states that magnification depends only on the focal length of the lens. This is incorrect because magnification also depends on the distance of the object from the lens.
Conclusion:
In a simple microscope, the focal length of the lens is less than the least distance for clear vision. This allows for higher magnification by bringing the virtual image closer to the eye.
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In a simple microscope, _______.a)a lens with negative power is usedb)the focal length of the lens is less than the least distance for clear visionc)the focal length of the lens is greater than the least distance for clear visiond)magnification depends only on the focal length of the lensCorrect answer is option 'B'. Can you explain this answer?
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In a simple microscope, _______.a)a lens with negative power is usedb)the focal length of the lens is less than the least distance for clear visionc)the focal length of the lens is greater than the least distance for clear visiond)magnification depends only on the focal length of the lensCorrect answer is option 'B'. Can you explain this answer? for IIT JAM 2024 is part of IIT JAM preparation. The Question and answers have been prepared according to the IIT JAM exam syllabus. Information about In a simple microscope, _______.a)a lens with negative power is usedb)the focal length of the lens is less than the least distance for clear visionc)the focal length of the lens is greater than the least distance for clear visiond)magnification depends only on the focal length of the lensCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for IIT JAM 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a simple microscope, _______.a)a lens with negative power is usedb)the focal length of the lens is less than the least distance for clear visionc)the focal length of the lens is greater than the least distance for clear visiond)magnification depends only on the focal length of the lensCorrect answer is option 'B'. Can you explain this answer?.
In a simple microscope, _______.a)a lens with negative power is usedb)the focal length of the lens is less than the least distance for clear visionc)the focal length of the lens is greater than the least distance for clear visiond)magnification depends only on the focal length of the lensCorrect answer is option 'B'. Can you explain this answer? for IIT JAM 2024 is part of IIT JAM preparation. The Question and answers have been prepared according to the IIT JAM exam syllabus. Information about In a simple microscope, _______.a)a lens with negative power is usedb)the focal length of the lens is less than the least distance for clear visionc)the focal length of the lens is greater than the least distance for clear visiond)magnification depends only on the focal length of the lensCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for IIT JAM 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a simple microscope, _______.a)a lens with negative power is usedb)the focal length of the lens is less than the least distance for clear visionc)the focal length of the lens is greater than the least distance for clear visiond)magnification depends only on the focal length of the lensCorrect answer is option 'B'. Can you explain this answer?.
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