Your camera determines the focal distance required for your picture to be in focus using the lens equation, , where the focal di
stance to the object from the lens (D) is related to the focal length (F) and the distance from the lens to the film (S). If an object is placed 8 cm from a lens with a focal length of 4 cm, how far from the lens is the image (film) formed?
2100 calories We find this by multiplying 600 times 3.5 An easy way to do this is multiplying 600 times 3 (1800) and the adding half of 600 (300) to your number for the final number of 2100 calories.