Simplify the following text for a Grade 4 native English-speaking person.
Original: A camera lens ( also known as photographic lens , objective lens or photographic objective ) is an optical lens or assembly of lenses used in conjunction with a camera body and mechanism to make images of objects either on photographic film or on other media capable of storing an image chemically or electronically .
Simplified: A camera lens is the part of a camera which is usually made from glass . A lens is needed if someone wants to take a picture .