Question

Please help by step by step solution ​

Answer 1

we know that

u=-80 cm

hi=2 ho

$m = \frac{ - v}{u} = \frac{2ho}{ho} \\ v = - 2u$

As per mirror formula,

$\frac{1}{f} = - \frac{1}{2u} + \frac{1}{u} \\ \frac{1}{f} = \frac{u}{2 {u}^{2} } \\ f = 2u = - 160cm$

I hope this helps ( ╹▽╹ )