Question

please solve this physics​

Answer 1

according to the given question , we know that the mirror formula is

1/f = 1/v + 1/u ---------(1)

where f → focal length = -20 cm

v → image distance

u→object distance

now, according to the given question ,

hi / ho = - V/U = 2

⇒ hi = 2ho also v = -2u

since we got v = -2u -----(2)

now by substituting equation (2) in (1) gives

⇒ -1/20 = -1/2u + 1/u

⇒ -1/20 = -1 + 2 / 2u

⇒ -1/20 = 1/2u

⇒ 2u = - 20

⇒ u = -10 cm

I hope you have understand