Tube length (distance between objective and eyepiece) when the final image is at least distance of clear vision (D=25 cm) is :

Q. The focal length of the objective and eyepiece of an astronomical telescope are $20\text{cm}$ and $20\text{cm}.$ If the final image is at the minimum distance of clear vision. Then the length of the tube will be-

Q. Compound microscope has magnification $30$. Focal length of eyepiece is $5cm$ and final image is formed at least distance of distinct vision. Find magnification of objective.

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. The focal lengths of objective and eyepiece of a compound microscope are $5cm$, $6.25cm$ respectively. When an object is placed in front of the objective at a distance of $6.25cm$, the final image is formed at least distance of distinct vision. The length of a microscope is :

Q. Magnification of a compound microscope is $30$. Focal length of eyepiece is $5\text{cm}$ and the final image is formed at the least distance of distinct vision. Find the magnification of objective lens.