# 200mm equivalent magnification?

It depends on the film format. For 35mm, that is about 4x magnification.

### Find the volume of cylinder having top dia 100mm and bottom dia 200mm with height 200mm?

The volume is 3500000/3 π mm3 ~=3665191 mm3 (~= 3.67 litres). A cylinder normally has a constant cross section. What you have is a cone with the top chopped off, thus its volume is the volume of the whole cone minus the volume of the top cone: The diameter reduces from 200mm to 100mm (that is 100mm) in 200mm height so it will reduce from 100mm to 0mm (that is a further 100mm) in a…

### The magnification of a telescope is changed by changing the what?

The magnification of a telescope is the ratio of the effective focal length of the objective to the focal length of the eyepiece. For example, a small telescope's objective may have a focal length of 800mm. When an eyepiece with a focal length of 25mm is used, the magnification is 800/25 = 32. The term "effective focal length" refers to the focal length of the objective as affected by any "focal extender". Many telescopes are…

### What it means 18mm - 200 mm in photo lens?

This describes the focal length range of the lens. It means that the lens can be set between 18mm (a wide angle which takes in a larger field of view) and 200mm (a telephoto, which creates a narrower field of view). ******* Note: the above is certainly true for 35mm format, but focal length is relative to the format. For 4x5 cameras, the equivalent "normal" focal length is around 200mm.