MCQ
After tracing the path of a ray of light passing through a rectangular glass slab for four different values of the angle of incidence, a student reported his observations in tabular form as given below:
The best observation is:
| S. No. | $\angle\text{ i}$ | $\angle\text{ r}$ | $\angle\text{ e}$ |
| I | $30^{0}$ | $19^{0}$ | $29^{0}$ |
| II | $40^{0}$ | $28^{0}$ | $40^{0}$ |
| III | $50^{0}$ | $36^{0}$ | $50^{0}$ |
| IV | $60^{0}$ | $40^{0}$ | $59^{0}$ |
- AI
- BII
- CIII
- DIV