engineering recuitment ICAR Technician 2021 Mock Test (Re-Exam) Physics Optics Refraction and Reflection
If θ1 and θ2 be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip θ is given by
1
tan2θ = tan2θ1 – tan2θ2
2
cot2θ = cot2θ1 + cot2θ2
3
tan2θ = tan2θ1 + tan2θ2
4
cot2θ = cot2θ1 – cot2θ2