1) An object is 1.0 cm tall and its inverted image is 3.0 cm tall. What is the exact magnification?
2) A ____can be considered as an ultrathin beam of light that travels in a straight line until it meets a reflecting or refracting surface.
Answer
1) Use the following formula to find the magnification.
m=-\frac{\text { image height }}{\text { object height }}
=-\frac{3 \mathrm{~cm}}{1 \mathrm{~cm}}
=-3 \mathrm{~cm}
2) A Light ray can be considered as ultrathin beam of light that travels in a straight line until it meets a reflecting or refracting surface.
