JEE Main & Advanced Physics Ray Optics Astronomical Telescope (Refracting Type)

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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