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Standard XII
Physics
Optical Instruments : Microscope
Question

The optical powers of the objective and the eyepiece of a microscope are equal to 100 D and 20 D respectively.The angular magnification is equal to 50 when the eye is relaxed. What will the magnification of the microscope be when the distance between the objective and the eyepiece is increased by 2.0 cm but the eye is still relaxed?

A
60
B
40
C
72
D
20
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Solution
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Correct option is A. 60

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Similar Questions
Q1
The optical powers of the objective and the eyepiece of a microscope are equal to 100 D and 20 D respectively.The angular magnification is equal to 50 when the eye is relaxed. What will the magnification of the microscope be when the distance between the objective and the eyepiece is increased by 2.0 cm but the eye is still relaxed?
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Q2
The optical powers of the objective and the ocular of a microscope are equal to 100 and 20 D respectively. The microscope magnification is equal to $$ 50. $$ What will the magnification of the microscope be when the distance between the objective and the ocular is increased by $$ 2.0 \mathrm{cm}? $$
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Q3
The total magnification produced by a compound microscope is 20. The magnification produced by the eye piece is 5. The microscope is focussed on a certain object. The distance between the objective and eyepiece is observed to be 14cm.
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Q4
The total magnification produced by a compound microscope is 20. The magnification produced by the eye piece along is 5. The microscope is focused on a certain object. The distance between the objective and eyepiece is observed to be 14cm. Then the focal lengths of the objective and eyepiece are respectively, if final image formed at near point
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Q5

An optical instrument used for angular magnification has a 25 D objective and a 20 D eyepiece. The tube length is 25 cm when the eye is least strained.

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