(i) State the condition under which a large magnification can be achie

1.	(i) State the condition under which a large magnification can be achieved in an astronomical telescope.(ii) Give two reasons to explain why a reflecting telescope is preferred over a refracting telescope.
Answer» (i) \(m=\frac{f_o}{f_e}\) By increasing f_o/ decreasing f_e (ii) Any two (a) No chromatic aberration (b) No spherical aberration (c) Mechanical advantage – low weight, easier to support (d) Mirrors are easy to prepare (e) More economical

(i) State the condition under which a large magnification can be achieved in an astronomical telescope.(ii) Give two reasons to explain why a reflecting telescope is preferred over a refracting telescope.

Answer»

(i) \(m=\frac{f_o}{f_e}\)

By increasing f_o/ decreasing f_e

(ii) Any two

(a) No chromatic aberration

(b) No spherical aberration

(c) Mechanical advantage – low weight, easier to support

(d) Mirrors are easy to prepare

(e) More economical