NEET Exam > NEET Questions > If the focal length of objective and eye len...
Start Learning for Free
If the focal length of objective and eye lens are 1.2 cm and 3 cm, respectively and the object is put 1.25 cm away from the objective lens, the final image is formed at infinity. The magnifying power of the microscope is
- a)400
- b)250
- c)200
- d)150
Correct answer is option 'C'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Most Upvoted Answer
If the focal length of objective and eye lens are 1.2 cm and 3 cm, re...
The magnifying power of a microscope is given by the formula:
Magnifying power (M) = 1 + (D/F)
Where D is the least distance of distinct vision (25 cm) and F is the focal length of the objective lens.
In this case, the focal length of the objective lens (F1) is given as 1.2 cm and the focal length of the eye lens (F2) is given as 3 cm. The object is placed at a distance of 1.25 cm from the objective lens, and the final image is formed at infinity.
Let's calculate the magnifying power step by step:
Step 1: Calculate the distance of the object from the objective lens:
Distance of object (u) = 1.25 cm
Step 2: Calculate the distance of the image formed by the objective lens (v1):
Using the lens formula: 1/u + 1/v1 = 1/F1
Substituting the given values, we get: 1/1.25 + 1/v1 = 1/1.2
Solving the equation, we find: v1 = -6 cm
(Note: The negative sign indicates that the image formed by the objective lens is virtual and on the same side as the object)
Step 3: Calculate the distance of the image formed by the eye lens (v2):
Using the lens formula: 1/v1 + 1/v2 = 1/F2
Substituting the values, we get: 1/-6 + 1/v2 = 1/3
Solving the equation, we find: v2 = 6 cm
(Note: The positive sign indicates that the image formed by the eye lens is real and on the opposite side to the object)
Step 4: Calculate the magnifying power:
Magnifying power (M) = 1 + (D/F1)
Substituting the values, we get: M = 1 + (25/1.2) = 1 + 20.83 = 21.83
The magnifying power of the microscope is approximately 21.83, which is closest to option (C) 200.
Therefore, the correct answer is option (C) 200.
Magnifying power (M) = 1 + (D/F)
Where D is the least distance of distinct vision (25 cm) and F is the focal length of the objective lens.
In this case, the focal length of the objective lens (F1) is given as 1.2 cm and the focal length of the eye lens (F2) is given as 3 cm. The object is placed at a distance of 1.25 cm from the objective lens, and the final image is formed at infinity.
Let's calculate the magnifying power step by step:
Step 1: Calculate the distance of the object from the objective lens:
Distance of object (u) = 1.25 cm
Step 2: Calculate the distance of the image formed by the objective lens (v1):
Using the lens formula: 1/u + 1/v1 = 1/F1
Substituting the given values, we get: 1/1.25 + 1/v1 = 1/1.2
Solving the equation, we find: v1 = -6 cm
(Note: The negative sign indicates that the image formed by the objective lens is virtual and on the same side as the object)
Step 3: Calculate the distance of the image formed by the eye lens (v2):
Using the lens formula: 1/v1 + 1/v2 = 1/F2
Substituting the values, we get: 1/-6 + 1/v2 = 1/3
Solving the equation, we find: v2 = 6 cm
(Note: The positive sign indicates that the image formed by the eye lens is real and on the opposite side to the object)
Step 4: Calculate the magnifying power:
Magnifying power (M) = 1 + (D/F1)
Substituting the values, we get: M = 1 + (25/1.2) = 1 + 20.83 = 21.83
The magnifying power of the microscope is approximately 21.83, which is closest to option (C) 200.
Therefore, the correct answer is option (C) 200.
Free Test
FREE
| Start Free Test |
Community Answer
If the focal length of objective and eye lens are 1.2 cm and 3 cm, re...
Magnifying power
= 
= 200
Attention NEET Students!
To make sure you are not studying endlessly, EduRev has designed NEET study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in NEET.
|
Explore Courses for NEET exam
|
|
Similar NEET Doubts
Top Courses for NEETView all
If the focal length of objective and eye lens are 1.2 cm and 3 cm, respectively and the object is put 1.25 cm away from the objective lens, the final image is formed at infinity. The magnifying power of the microscope isa)400b)250c)200d)150Correct answer is option 'C'. Can you explain this answer?
Question Description
If the focal length of objective and eye lens are 1.2 cm and 3 cm, respectively and the object is put 1.25 cm away from the objective lens, the final image is formed at infinity. The magnifying power of the microscope isa)400b)250c)200d)150Correct answer is option 'C'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about If the focal length of objective and eye lens are 1.2 cm and 3 cm, respectively and the object is put 1.25 cm away from the objective lens, the final image is formed at infinity. The magnifying power of the microscope isa)400b)250c)200d)150Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for If the focal length of objective and eye lens are 1.2 cm and 3 cm, respectively and the object is put 1.25 cm away from the objective lens, the final image is formed at infinity. The magnifying power of the microscope isa)400b)250c)200d)150Correct answer is option 'C'. Can you explain this answer?.
If the focal length of objective and eye lens are 1.2 cm and 3 cm, respectively and the object is put 1.25 cm away from the objective lens, the final image is formed at infinity. The magnifying power of the microscope isa)400b)250c)200d)150Correct answer is option 'C'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about If the focal length of objective and eye lens are 1.2 cm and 3 cm, respectively and the object is put 1.25 cm away from the objective lens, the final image is formed at infinity. The magnifying power of the microscope isa)400b)250c)200d)150Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for If the focal length of objective and eye lens are 1.2 cm and 3 cm, respectively and the object is put 1.25 cm away from the objective lens, the final image is formed at infinity. The magnifying power of the microscope isa)400b)250c)200d)150Correct answer is option 'C'. Can you explain this answer?.
Solutions for If the focal length of objective and eye lens are 1.2 cm and 3 cm, respectively and the object is put 1.25 cm away from the objective lens, the final image is formed at infinity. The magnifying power of the microscope isa)400b)250c)200d)150Correct answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for NEET.
Download more important topics, notes, lectures and mock test series for NEET Exam by signing up for free.
Here you can find the meaning of If the focal length of objective and eye lens are 1.2 cm and 3 cm, respectively and the object is put 1.25 cm away from the objective lens, the final image is formed at infinity. The magnifying power of the microscope isa)400b)250c)200d)150Correct answer is option 'C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
If the focal length of objective and eye lens are 1.2 cm and 3 cm, respectively and the object is put 1.25 cm away from the objective lens, the final image is formed at infinity. The magnifying power of the microscope isa)400b)250c)200d)150Correct answer is option 'C'. Can you explain this answer?, a detailed solution for If the focal length of objective and eye lens are 1.2 cm and 3 cm, respectively and the object is put 1.25 cm away from the objective lens, the final image is formed at infinity. The magnifying power of the microscope isa)400b)250c)200d)150Correct answer is option 'C'. Can you explain this answer? has been provided alongside types of If the focal length of objective and eye lens are 1.2 cm and 3 cm, respectively and the object is put 1.25 cm away from the objective lens, the final image is formed at infinity. The magnifying power of the microscope isa)400b)250c)200d)150Correct answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice If the focal length of objective and eye lens are 1.2 cm and 3 cm, respectively and the object is put 1.25 cm away from the objective lens, the final image is formed at infinity. The magnifying power of the microscope isa)400b)250c)200d)150Correct answer is option 'C'. Can you explain this answer? tests, examples and also practice NEET tests.
|
|
Explore Courses for NEET exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup