Question

question no 14 plz anyone answer

Answer 1

mirror formula is also applicable to plane mirror B using it we find focal length to be infinite..
$\frac{1}{f} = \frac{1}{u} + \frac{1}{v} \\ as \\ \frac{1}{f} = \frac{1}{u} + \frac{ - 1}{ ( - u) } = 0 \\ f = \frac{1}{0} = \infty$