

Let f1 and f2 be the focal lengths of the objective and eyepiece of the refracting telescope, respectively. The formula for multiples of the telescope
This text in the case of looking at infinity G is?
@Tên để làm gì can you help me this question please ??
This text in the case of looking at infinity G is?
@Tên để làm gì can you help me this question please ??