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 eyepiece, find the separation between the lenses required for distinct vision

Q. An astronomical telescope has the objective lens and the eyepiece of focal lengths $80\text{cm}$ and $5\text{cm}$ respectively. Find its magnifying power, if the final image is formed at a distance of $50\text{cm}$ from the eyepiece.

Q. Find the length of the astronomical telescope if it is adjusted such that the final image is formed at the least distance of distinct vision. Focal length of objective lens and eyepiece are $80\text{cm}$ and $5\text{cm}$ respectively.

Q. An astronomical telescope has an angular magnification of magnitude $5$ for distant objects.The separation between the objective and the eyepiece is $36cm$. The final image is formed at infinity. The focal lengths of the objective and the eyepiece are respectively:

Q. An astronomical telescope has focal lengths $100$ & $10$cm of objective and eyepiece lens respectively when final image is formed at least distance of distinct vision,magnification power of telescope will be,

Q. A astronomical telescope has objective and eyepiece of focal lengths $40cm$ and $4cm$ respectively. To view an object $200cm$ away from the objective, the lenses must be separated by a distance: