A Keplerian Telescope uses a convex lens as the objective lens to gather light from distant objects and a concave lens as the eyepiece to magnify the image formed by the objective lens. This combination of lenses creates an inverted and magnified image of the object being viewed.
7X magnification means that the image seen through the eyepiece will appear 7 times larger than its actual size. This level of magnification is often suitable for viewing celestial objects such as planets and stars.
The exit pupil of a telescope is calculated by dividing the diameter of the objective lens by the magnification. In this case, the exit pupil would be 5mm because the objective lens has a diameter of 35mm and the magnification is 7X (35/7=5).
Yes, this telescope can be used for both terrestrial and celestial viewing. However, the image may appear upside down when viewing terrestrial objects due to the inverted image formation in a Keplerian Telescope.
To improve the image quality of this telescope, you can use higher quality lenses with better coatings to reduce glare and increase contrast. You can also ensure that the lenses are properly aligned and clean to avoid any distortions in the image.