Question

.A dog standing in front of a concave mirror with a focal length of 10.0 cm creates a real image 30.0 cm away on its principal axis; How far is the dog away from the mirror ?

Answer 1

Answer:

Use the mirror equation:

1/di + 1/do = 1/f

where di = +30 cm and f = +10 cm.

Substitute and solve for do.

1/do + 1/(30 cm) = 1/(10 cm)

1/do = 1/(10 cm) - 1/(30 cm) = 2/(30 cm)

do = 15 cm

Explanation: