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  4. An astronomical telescope in normal adjustment receives light from a distant source S the tube length is now decreased slightly, then

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Q. An astronomical telescope in normal adjustment receives light from a distant source S the tube length is now decreased slightly, then

Bihar CECEBihar CECE 2010Ray Optics and Optical Instruments

Solution:

In an astronomical telescope, $ L=f _0+ f_e $ When tube length is decreased, the image formed by the objective lens will lie between principal focus and optical centre of eye lens instead of lying at the focus of eye lens. Therefore, a virtual image will be formed at a finite distance from the eye lens.