# Fundamentals of light

## Everything You Need in One PlaceHomework problems? Exam preparation? Trying to grasp a concept or just brushing up the basics? Our extensive help & practice library have got you covered. | ## Learn and Practice With EaseOur proven video lessons ease you through problems quickly, and you get tonnes of friendly practice on questions that trip students up on tests and finals. | ## Instant and Unlimited HelpOur personalized learning platform enables you to instantly find the exact walkthrough to your specific type of question. Activate unlimited help now! |

#### Make math click 🤔 and get better grades! 💯Join for Free

##### Intros

##### Examples

###### Lessons

- What is the frequency of red light, $\lambda$ = 635nm?
- Calculate the distance covered by light in feet for 1ns.
- What is the length of green light that lasts for 4.0 fs?
- How many wavelengths of green light ($\lambda$ = 550 nm) are included in such a pulse?

- Calculate the distance from Earth to the moon knowing that a pulse of light sent to the moon takes 2.562s to return back to Earth.
- Light takes 16 minutes to cross Earth's orbit (3.0× 10
^{11}m). calculate the speed of light - What is the illumination on a wall if it is lighted by 1750-lm light bulb which is 1.50 m away from the wall?
- A lamp is moved from 40cm to 80cm above the pages of a book. What is the illumination before and after the lam is moved?
- The illumination on desktop is 3.0 × 10
^{2}lx. The source providing the illumination is 2.0m above the desk. What is the intensity (luminous flux) of the lamp?