A microscope is focused on a mark on a table, when the mark is covered by a plate of glass 2m thick, the microscope has to be raised 0.67cm for the mark to be once more in focus. Calculate the refractive index.
-
A.
1.50 -
B.
1.68 -
C.
2.58 -
D.
1.82
Correct Answer: Option A
Explanation
R = th = 2cm, d = 0.67cm
| n | = | R
A |
= | R
R.d |
= | 2 2-0.67 |
= | 1.52 |
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