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The objective and eyepiece of an astrono...

The objective and eyepiece of an astronomical telescope are double convex lenses with refractive index 1.5. When the telescope is adjusted to infinity, the separation between the two lenses is 16 cm. If the space between the lenses is now filled with water and again telescope is adjusted for infinity, then the present separation between the lenses is

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The objective and eye piece of an astronomical telescope are double convexlenses with refractive jndex 1.5. When the telescope is adjusted to infinity the seperation between the lenses is 16 cm. If the space between the lenses is now filled with water and again telescope is adjusted for infinity. Then the present separation between the lenses is

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The focal lengths of the objective and the eyepiece of an astronomical telescope are 20 cm and 5 cm respectively. If the final image is formed at a distance of 30 cm from the eye piece, find the separation between the lenses for distinct vision:

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The focal lengths of the objective and the eyepiece of an astronomical telescope are 140 cm and 5 cm respectively. (ii) When the telescope is in normal adjustment (i.e the final image is formed at infinity ), the magnifying power of the telescope will be