Re: Reflection from primary to secondary mirror

The reflected image produced by your primary mirror is can be as large as
you wish, several feet across in fact.  The size of the secondary is such
that it reflects what is required for your eyepiece, but it could be much
larger.

Del Johnson



"Jim English" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> I have a dobsonian telescope.  Last night while I was observing the
> moon,I put my hand behind the secondary mirror about 3 or so inches
> and noticed light apparently passing by the secondary and reflecting
> onto my hand.  I am a novice and assumed that the all the light from
> the primary should be reflected back to the secondary in a cone shape.
>  Is this normal.
>
> Thanks