A. 0.50
B. 0.67
C. 0.75
D. 1.13
Correct Answer: Option A
A. 0.50
Explanation
9nn=3/4×2/3=0.5
![A travelling microscope is focused on a mark on a table. If a glass block of thickness 18.0cm is placed on the mark by how many centimeters will the microscope be moved upwards so as to focus the mark once again? [refractive index of glass = 1.5]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "A travelling microscope is focused on a mark on a table. If a glass block of thickness 18.0cm is placed on the mark by how many centimeters will the microscope be moved upwards so as to focus the mark once again? [refractive index of glass = 1.5]")
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