Physics · PYQ NEET UG 2017

If \( \theta_1 \) and \( \theta_2 \) be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip \( \theta \) is given by

1. A
   \( \cot^2\theta = \cot^2\theta_1 + \cot^2\theta_2 \)
2. B
   \( \tan^2\theta = \tan^2\theta_1 + \tan^2\theta_2 \)
3. C
   \( \cot^2\theta = \cot^2\theta_1 - \cot^2\theta_2 \)
4. D
   \( \tan^2\theta = \tan^2\theta_1 - \tan^2\theta_2 \)