Question

An object is located 5.0 cm from a concave mirror. The focal length is 15.0 cm. What is the image distance? Use the equation attached.

A.3.8 Cm
B.-3.8 Cm
C.-7.5 Cm
D.7.5 Cm

Answer 1

C. -7.5 cm

Step-by-step explanation:

got it right, trust

Answer 2

-7.5 cm

Step-by-step explanation:

OK so in the equation they're having you use the variables are:

`d_o = 5.0 cm\\\\f = 15.0 cm\\\\d_i = ?`

So we simply plug in the variables:

`d_i = (d_of)/(d_o-f) \\\\d_i = (5.0 * 15.0)/(5.0 - 15.0)\\\\d_i = (75)/(-10)\\\\d_i = -7.5 cm`