Question

An object is located 30.0 cm from a concave mirror. The focal length is 15.0 c,. What is the image distance?

A. 30.0 cm

B. -10 cm

C. 10.0 cm

D. -30.0 cm

Answer 1

30.0 cm

Step-by-step explanation:

We can use the mirror equation:

`(1)/(f)=(1)/(p)+(1)/(q)`

where

f = +15.0 cm is the focal length of the mirror

p = 30.0 cm is the distance of the object from the mirror

q is the distance of the image from the mirror

Solving the equation for q, we find

`(1)/(q)=(1)/(f)-(1)/(p)=(1)/(15.0 cm)-(1)/(30.0 cm)=(1)/(30.0 cm)\\q = 30.0 cm`