question_answer

How does the (i) magnifying power and (ii) resolving power of a telescope change on increasing the diameter of its objective? Give reasons for your answer.                              

Answer:

                (i) Magnifying power \[=\frac{{{f}_{0}}}{{{f}_{e}}}\]. Clearly, it does not change on increasing the diameter of the objective. (ii) Resolving power of a telescope \[=\frac{D}{1.22\lambda }\] Clearly, resolving power of the telescope increases on increasing the diameter of its objective.