JAMB - Physics (2019 - No. 54)
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.
1.50
1.68
2.58
1.82
Explicación
R = th = 2cm, d = 0.67cm
| n | = | R
A |
= | R
R.d |
= | 2
2-0.67 |
= | 1.52 |