As reflector telescopes gather light and make dimmer images brighter, so if I viewed through telescope with 1x magnification or viewed the horizon ,would I see the strip of milky way?
A telescope (or any system of lenses and mirrors) can't produce an image that is brighter than the source. So while a telescope can gather more light, it can never raise the surface brightness of a source. Most nebulae do not look brightly coloured in an eyepiece, because their surface brightness is low.
There are significant biological factors here, in how your eyes detect colour and how your brain interprets the signal from your eyes. But you cannot create a 1x telescope that makes the image you see brighter, but not larger.
(Such a thing would be "magic". If you could make an image brighter, you are creating energy from nothing)
To create the coloured images that you see in books or on the internet, long-period photography must be used.