Question

Question 18 (5 points)

 

A concave mirror has a focal length of -27.0 cm. Find the magnification produced by the mirror when the object distance is 9.0 cm and 18.0 cm.

Question 18 options:

A) 

No option correct

B) 

0.750 and 0.600

C) 

0.850 and 0.500

D) 

0.950 and 0.800

E) 

0.650 and 0.700

Answer 1

$$\frac 1f=\frac1{i_1}+\frac1{o_1},\\\space\\ \frac 1{-27}=\frac1{i_1}+\frac1{9},\\\space\\ i_1=-6.75,\\\space\\ m_1=\frac{i_1}{o_1}=-0.75.$$

Thus, neither option is correct.