Astronomical Telescope (Refracting Type)
Category : JEE Main & Advanced
By astronomical telescope heavenly bodies are seen.
(1) \[{{f}_{\text{objective}}}>{{f}_{\text{eyelens}}}\]and \[{{d}_{\text{objective}}}>{{d}_{\text{eye lens}}}\].
(2) Intermediate image is real, inverted and small.
(3) Final image is virtual, inverted and small.
(4) Magnification : \[{{m}_{D}}=-\frac{{{f}_{0}}}{{{f}_{e}}}\left( 1+\frac{{{f}_{e}}}{D} \right)\] and \[{{m}_{\infty }}=-\frac{{{f}_{o}}}{{{f}_{e}}}\]
(5) Length : \[{{L}_{D}}={{f}_{0}}+{{u}_{e}}\] and \[{{L}_{\infty }}={{f}_{0}}+{{f}_{e}}\]
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