A. 48.6°
B. 22.5°
C. 41.5°
D. 45.0°
Correct Answer:
Option C = 41.5°
Explanation
SinC = (1)/n
= (1)/1.51 = 0.6622
∴ C = sin +0.6622 = 41.47
If the refractive index of crown glass is 1.51; its critical angel is?
![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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