Why Does a Telephoto Lens Have a Longer Focal Length Than a Single Convex Lens?

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A telephoto lens is considered to have a longer focal length than a single convex lens due to its design, which typically combines multiple lens elements, including diverging and convex lenses. This combination allows for a greater distance between the lens and the camera sensor, effectively increasing the focal length. The longer focal length enables the lens to magnify distant subjects while maintaining a narrow field of view. The optical configuration of a telephoto lens enhances its ability to compress perspective and capture images with greater detail from afar. Understanding these principles is essential for photographers seeking to utilize telephoto lenses effectively.
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1. Why is a telephoto lens considered to have a longer focal length than that of a single convex lens?

A lens combination, such as a diverging and a convex lens, is referred to as a telephoto lens. Suggest why a telephoto lens is considered to have a longer focal length than that of a single convex lens.
 
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If you just look at a camera with a telephoto lens, the distance from the front of the lens to the sensor inside the camera is very large.
 

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