The focal length of a plane mirror is:

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(B) The relationship between focal length $f$ and radius of curvature $R$ is given by $f = \frac{R}{2}$.For a plane mirror,the surface is flat,which m

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Infinite

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(B) The relationship between focal length $f$ and radius of curvature $R$ is given by $f = \frac{R}{2}$.For a plane mirror,the surface is flat,which means it can be considered as a part of a sphere with an infinite radius of curvature $(R = \infty)$.Substituting this into the formula,we get $f = \frac{\infty}{2} = \infty$.Therefore,the focal length of a plane mirror is infinite.

$(a)$ Angle of reflection	$(i)$ $60^\circ$
$(b)$ Value of $\alpha$	(ii) $120^\circ$
$(c)$ Angle of deviation	(iii) $30^\circ$

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With reference to the figure shown below, match the following:
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$(b)$ Value of $\alpha$ (ii) $120^\circ$
$(c)$ Angle of deviation (iii) $30^\circ$