Question

i extremely need your help ​

Answer 1

12. F= -F (concave mirror), u=-2F , 1/f=1/v+1/u,

-1/F=1/v-1/2F , 1/v= -1/F+1/2F , v= -2F means image form on 2F same position , m= - v/u , m= -(-2F)/-2F then m is -1 means same height of image real and inverted . 13. answer is 6 cm