What are reflecting type of telescope ? Explain the advantages and disadvantages of reflecting telescopes as compared to refracting telescope and also give the solution.

Explanation

For the problems in making of lens of high resolution and large magnification modern telescopes use a concave mirror rather than a lens for the objective.
Telescopes with mirror objective are called reflecting telescopes.
Advantages :
1) There is no chromatic aberration in a mirror.
2) If a parabolic reflecting surface is chosen, spherical aberration is also removed.
3) Mechanical support is much less of a problem since a mirror weighs much less than a lens of equivalent optical quality and can be supported over its entire back surface, not just over its rim.
Disadvantages : The objective mirror focuses light inside the telescope tube. One must have an eyepiece and the observer right there.
Obstructing some light (depending on the size of the observer cage).
This is what is done in the very large 200 inch (~ 5.08 m) diameters Mt. Palomar telescope, California.
The viewer sits near the focal point of the mirror in a small cage. Another solution to the problem is to deflect the light being focussed by another mirror.