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  • Plane angle and solid angle have:  Option: 1 Dimensions but no units  Option: 2

Plane angle and solid angle have:
 

Option: 1

Dimensions but no units
 


Option: 2

No units and no dimensions
 


Option: 3

 Both units and dimensions
 


Option: 4

 Units but no dimensions


Answers (1)

best_answer

\begin{aligned} & \text{plane angle} = \theta \\ & = \frac{\text{length of arc subtended}}{\text{radius of arc}}\\ &\text{Solid angle} (\Omega)=\frac{\text { Area subtended}}{(\text { radius })^{2}} \end{aligned}
\therefore Both plane angle and solid angle don't have dimensions, But the units of plane angle and solid angle are radian (rad) and steradian (sr) respectively.
the correct option is (4)

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