How does magnifying power change with change in length of tube for a given telescope?

How does the speed of sound change with change in wavelength of sound wave ?

Loudness does not change with the change in :

How does atmospheric pressure change with the change in altitude?

How does the speed of sound change with change in amplitude .

The magnifying power of a telescope can be increased

How does valency change within a group of the periodic table?

If tube length Of astronomical telescope is 105cm and magnifying power is 20 for normal setting, the focal length of the objective is:

Define magnifying power and resolving power of a telescope.

How does Young's modulus change with rise in temperature?

How does the density of gases change with the rise in temperature?