Question

A driving mirror consists of a cylindrical mirror of radius of curvature $10cm$ and the length over the curved surface is $10cm$. If the eye of the driver be assumed to be at a great distance from the mirror, then field of view in radian is

• A. $2.0$
• B. $4.0$
• C. $3.0$
• D. $5.0$

Answer 1

The correct option is A $2.0$

From the figure,

$Angle,\theta =\frac{arc\left(l\right)}{radius\left(r\right)}=\frac{10}{5}=2rad$