Grid North:
Grid North is the direction of the vertical grid lines shown on a map, pointing towards the top of the map.
Magnetic Variation:
Magnetic variation is the angular difference between True North and Magnetic North. It varies based on location and time.
Cardinal Points:
Cardinal points are the four main directions on a compass: North, East, South, and West.
Magnetic North:
Magnetic North is the direction a magnetic compass needle points, which aligns with the Earth’s magnetic field.
| Case No. | Lens | Focal Length | Object Distance |
|---|---|---|---|
| 1 | \(A\) | 50 cm | 25 cm |
| 2 | B | 20 cm | 60 cm |
| 3 | C | 15 cm | 30 cm |