Verified answer

Since magnification is calculated by dividing the focal length of the telescope by the focal length of the eyepiece, so to get more magnification you need an eyepiece with a shorter focal length. However, any increase in magnification will lead to a decrease in sharpness, because the resolution of the telescope doesn't change. If you give us more information about your telescope, such as aperture and focal length, we can give you more specific advice.

The smaller number will give you more magnification, so a 6mm will give you more than your 10mm, but that doesn't necessarily mean you'll see more clearly. (Do you only own one eyepiece, so that you couldn't see this for yourself? )You'll always be limited by the ability of your scope to gather light, and the atmospheric conditions through which you're viewing, so you might want to reconsider spending money on a higher magnification until you pick up something like a 25mm that will show you more of deep space.

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Magnification is the focal length of the objective lens divided by the focal length of the eyepiece lens.

The smaller the eyepieces lens focal length (the smaller the number) and the bigger the magnification.

Say 1000mm objective focal length / 20mm eyepiece = 50x

if the eyepiece was 5mm, that would be 200x

down in mm.