To increase magnification power of refracting type Telescope, we should increase :

Concept:

• To increase the magnification power of a refracting type telescope, we should increase the focal length of the objective lens or decrease the focal length of the eyepiece lens.
• This is because the magnification power of a telescope is determined by the ratio of the focal length of the objective lens to the focal length of the eyepiece lens.
• However, it's important to note that increasing the magnification power of a telescope beyond a certain point may not result in a clearer or better image.
• This is because factors such as atmospheric turbulence, optical aberrations, and aperture limitations can affect the clarity and resolution of the image.
• Therefore, it's important to strike a balance between magnification power and image quality.

Additional Information

Angular magnification: 

Angular magnification is defined as the ratio of the angle subtended by the image of an object which is seen from the telescope to the angle subtended by the same object without the aid of the telescope and it is written as;

Angular magnification, M = \(\frac{{{f_0}}}{{{f_E}}}\)

Here, fo is the focal length of an object and fE is the focal length of an eyepiece.

Angular resolution:

It is defined as the angle of resolving power of the telescope and it is written as;

Angular resolution = \(\frac{D}{{1.22\lambda }}\) 

Here, D is the diameter, which is the wavelength of the light which is used.