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A microscope is focused on an ink mark on the top of a table. If we place a glass slab 3cm thick on it, how should the microscope be moved to focus the ink spot again? The refractive index of glass slab is 1.5 cm.​
  • a)
    2 cm downward
  • b)
    1 cm upwards
  • c)
    1 cm downwards
  • d)
    2 cm upwards
Correct answer is option 'B'. Can you explain this answer?

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Anand Kumar
Oct 12, 2018
Related A microscope is focused on an ink mark on the top of a table. If we place a glass slab 3cm thick on it, how should the microscope be moved to focus the ink spot again? The refractive index of glass slab is 1.5 cm.​a)2 cm downwardb)1 cm upwardsc)1 cm downwardsd)2 cm upwardsCorrect answer is option 'B'. Can you explain this answer?
Concept: Relation between real depth,apparent depth and refrective index.Refractive index = Real depth/ apparent depth1.5 = 3/ apparent depthApparent depth = 3/1.5 = 2 cm.Distance through which the microscope is moved is=> 3 cm -2 cm = 1 cm upwards.Hence, correct answer is (b).

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Bhuwan Jindal
Jul 06, 2018
The image of the ink spot moves up by 1cm.

Refractive index = Real depth/ apparent depth


1.5 = 3/ apparent depth


Apparent depth = 3/1.5 = 2 cm


Distance through which the microscope is moved is 3 cm -2 cm = 1 cm upwards

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Vishnupriyan R
Dec 29, 2019
Related A microscope is focused on an ink mark on the top of a table. If we place a glass slab 3cm thick on it, how should the microscope be moved to focus the ink spot again? The refractive index of glass slab is 1.5 cm.​a)2 cm downwardb)1 cm upwardsc)1 cm downwardsd)2 cm upwardsCorrect answer is option 'B'. Can you explain this answer?
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A microscope is focused on an ink mark on the top of a table. If we place a glass slab 3cm thick on it, how should the microscope be moved to focus the ink spot again? The refractive index of glass slab is 1.5 cm.​a)2 cm downwardb)1 cm upwardsc)1 cm downwardsd)2 cm upwardsCorrect answer is option 'B'. Can you explain this answer? for Class 12 2022 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about A microscope is focused on an ink mark on the top of a table. If we place a glass slab 3cm thick on it, how should the microscope be moved to focus the ink spot again? The refractive index of glass slab is 1.5 cm.​a)2 cm downwardb)1 cm upwardsc)1 cm downwardsd)2 cm upwardsCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 12 2022 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A microscope is focused on an ink mark on the top of a table. If we place a glass slab 3cm thick on it, how should the microscope be moved to focus the ink spot again? The refractive index of glass slab is 1.5 cm.​a)2 cm downwardb)1 cm upwardsc)1 cm downwardsd)2 cm upwardsCorrect answer is option 'B'. Can you explain this answer?.
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Concept: Relation between real depth,apparent depth and refrective index.Refractive index = Real depth/ apparent depth1.5 = 3/ apparent depthApparent depth = 3/1.5 = 2 cm.Distance through which the microscope is moved is=> 3 cm -2 cm = 1 cm upwards.Hence, correct answer is (b).