Euler_Euclid said:
Euler_Euclid said:
Euler_Euclid said:Sorry I am new here so please forgive me if I have violated any rules.
The formula for finding the focal length of a lens is f = (u*v)/(u+v), where f is the focal length, u is the object distance, and v is the image distance.
The object distance can be measured by placing the object (such as a candle or an object with distinct markings) in front of the lens and measuring the distance from the object to the lens. The image distance can be measured by focusing the lens and measuring the distance from the lens to the image formed on a screen or surface.
The focal length of a lens determines the magnification and the size of the image produced by the lens. It is important to know the focal length in order to properly use and position the lens for desired results.
The focal length is typically measured in millimeters (mm) or centimeters (cm). However, it can also be measured in meters (m) or even inches (in) depending on the scale of the lens being used.
Yes, the focal length of a lens can change depending on the distance between the lens and the object or image. In this case, the focal length is changing from 20cm to 15cm as the lens is moved closer to the object. However, the focal length of a lens is a fixed value for a specific lens and cannot be altered without physically changing the lens itself.