Jill puts her face in front of a convex mirror, 18 cm from the focal point of the mirror. If the focal point is located 12 cm fr

Question

2 years ago

9

Jill puts her face in front of a convex mirror, 18 cm from the focal point of the mirror. If the focal point is located 12 cm fr

om the mirror, where will her image appear?
A. 4 cm behind the mirror
B. 8 cm behind the mirror
C. 4 cm in front of the mirror
D. 8 cm in front of the mirror

Physics

2 answers:

larisa86 [58] · Answer 1 · 2023-11-10T23:46:17+03:00

larisa86 [58]2 years ago

8 0

Answer: It's A

Explanation: The image is 4 cm from the mirror. The mirror is convex, so then the focal point and the image are both behind the mirror.

Bumek [7] · Answer 2 · 2023-11-10T22:28:13+03:00

A. 4 cm behind the mirror
 For any mirror, sosi=f^2. Therefore, by plugging in the values, you get 18si=144. 144/18 = 8, so si=8
 The focal point is located 12 cm from the mirror, and si is the distance of the image from the focal point, so the image is 4 cm from the mirror. The mirror is convex, so then the focal point and the image are both behind the mirror.