A. Na2CO3
B. K2CO3
C. K2SO4
D. NaHCO3
Correct Answer:
Option A – Na2CO3
Ordinary glass is manufactured from silica; CaCO3 and ________?
![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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