A. 1.5 x 108ms−1
B. 2.0 x 108ms−1
C. 3.0 x 108ms−1
D. 4.5 x 108ms−1
Correct Answer:
Option B = 2.0 x 108ms−1
Explanation
n = speed in air/speed in glass
1.5 = 3×10^4/speed in glass
Speed in glass = 3 x 10^8m/s / 1.5
= 2 x 108m/s
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![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]")
