In fact, the interest in mountain climbing lies in the unity of man and nature, the integration of the ground, the pursuit of the grassroots of plants in the wilderness, and the fragrance of the land.

It is said that climbing mountains are very tiring, especially climbing long distance continuous mountain more tiring! The real hardest stage is when we are ready to climb from the foot of the mountain, a long uphill road, which is very steep and long, the hardest part of the journey is just climbing up this broken road.

Panting, this time the muscles of the legs began to ache, and looking upward, there is no end, the heart sprouted retreat, looking at the people around them insisting on moving forward, insisting on climbing this slope, everyone has their own limits, but also have not tapped the potential, usually live a comfortable life.

Simply do not need to consider these things, but really encountered, in fact, our limits are far from imagining so strong.

Mountaineering generally needs hiking shoes, headlamps, raincoats, hiking bags, knee pads, sunglasses, down jackets, etc. Some people will also prepare binoculars, used to observe the distant scenery.

A telescope is an optical instrument that uses lenses or mirrors and other optical devices to observe distant objects. Its principle is to use the refraction of light through a lens or light reflected by a concave mirror so that it enters a small hole and converges imaging, and then through a magnifying eyepiece and be seen.

Overall, telescopes are broadly speaking divided into two types, the first is the Galileo telescope, and the second Kepler telescope, the biggest difference between the two telescopes is a final magnified imaging result for the positive image and a final magnified imaging result for the inverted image.

The telescope has two roles, the first is to magnify the open angle of the distant object so that the human eye can see the details of the angular distance is smaller. The second is to send the beam collected by the objective lens to the human eye so that the observer can see the original invisible dark and weak objects.

In daily life, telescope mainly refers to the optical telescope, mainly including amateur astronomical telescopes, theater viewing telescopes, and military binoculars. After more than 400 years of development, telescopes have become more and more powerful, and the observation distance has become longer and longer.

The telescope is light in turn through the objective lens, eyepiece, eye lens three convex lenses, and finally the original object in the retina into a real image. Due to the clever combination of the objective and eyepiece.

It happens that what is made is more than the eye directly, magnified (and because it may converge lighter, so it may be brighter) image only.

The distance between the objective and the eyepiece, strictly speaking, is not equal to the sum of the two focal lengths. But the sum of the image distance of the objective and the focal length of the eyepiece.