Question

holaaaaaaaaaa mates sorry for disturbing at night but plzz solve it
question 27 thank u

Answer 1

Hi mate........




Note before solving: I was not disturbed....It's my study time.




Since a real image has been, thus it is a CONCAVE MIRROR.




Step 1: Find the object distance.



$m = - \frac{1}{5} = - \frac{( - 18)}{u } \\ \\ u = 90 \: cm$



Now we have to use mirror formula




$\frac{1}{f} = \frac{1}{u} + \frac{1}{v}$




$\frac{1}{f} = \frac{1}{( - 18)} + \frac{1}{( - 90)} \\ \\ \\ \\ \\ f = 15 \: cm$



Therefore the answer is :






The mirror is a concave mirror. The focal length is -15 cm.




Note: The focal length of a concave mirror is always negative.



Hope you would be able to solve the last yourself and if you did not understand any step, plz comment.


All the best........



PLZ ME AS BRAINLIEST.......!