List- I (Layer of atmosphere) | List- II (Approximate height over earth's surface) | ||
A. | F1-Layer | I. | 10 km |
B. | D-Layer | II. | 170-190 km |
C. | Troposphere | III. | 100 km |
D. | E-layer | IV. | 65-75 km |
The portion of the line \( 4x + 5y = 20 \) in the first quadrant is trisected by the lines \( L_1 \) and \( L_2 \) passing through the origin. The tangent of an angle between the lines \( L_1 \) and \( L_2 \) is: