Question on: WAEC Physics - 2006
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]
A
27cm
B
24cm
C
9cm
D
6cm
Ask EduPadi AI for a detailed answer
Correct Option: D
Apparent depth = (\frac{\text{thickness}}{\text{refractive index}})
= (\frac{18}{1.5} = 12cm)
Upward adjustment = 18 - 12
= 6cm
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