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A travelling microscope is focused on a mark on a table. If a glass block...

Physics
WAEC 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
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Correct Answer: Option D
Explanation
Apparent depth = \(\frac{\text{thickness}}{\text{refractive index}}\)

= \(\frac{18}{1.5} = 12cm\)

Upward adjustment = 18 - 12

= 6cm
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