A travelling microscope is focused on a mark on a table. ...
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]
27cm
24cm
9cm
6cm
Correct answer is D
Apparent depth = thicknessrefractive index
= 181.5=12cm
Upward adjustment = 18 - 12
= 6cm
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