Physics over light

8. What is light intensity (what does intensity mean)? 9. What are the four main types of optical devices? Give an example of each. 10. What is the difference between a specular reflection and a diffuse reflection? 11. Light being bent when it crosses a boundary is an example of what? 12. What is the equation for magnification? 13. If the magnification is negative, what does that mean? 14. If a man is 2.3m tall in front of a mirror with a magnification of . 75, how tall will his image be? Show your work