If the power of the objective lens is 2D and eye lens is 20D for a telescope. What is the distance between 2 lenses the telescope at normal adjustment? A 0.055cm
B 0.55cm
C 5.5cm
D 55cm

Not all tiles will be usedidentify the element present in each star based on the gaps observed in wavelengths of its light refer to this table containing absorption wavelengths (in nm) of several different elements the table ishelium 447, 502 ,587 ,668carbon 427 ,515, 600 ,678sulfur 425, 565, 639, 675xenon 484, 590, 687calcium 429 ,527, 593, 645silver 421 ,521, 662

Oxygen and hydrogen gas are at the same temperature t.what is the ratio of kinetic energies of oxygen molecule and hydrogen molecule if oxygen is 16 times heavier than hydrogen.

How can you increase the strength of an electromagnet?