The focal length of object glass of a microscope is `0.02` m, that of the eye-piece is `0.04` and distance between them is `0.20`m. What is the distance of the object from the object glass when the image seen by the eye is `0.25`m from the eye-piece? Calculate also the magnifying power of the microscope.

The focal lengths of the objective and eye piece of a microscope are 2 cm and 5 cm respectively, and the distance between them is 20 cm . Find the distance of the object from the objective when the final image seen by the eye is 25 cm from the eye piece. What is the magnifying power ?

The focal length of the objective of an astronomical telescope is 75 cm and that of the eye-piece is 5 cm. If the final image is formed at the least distance of distinct vision from the eye, calculate the magnify- ing power of the telescope.

The focal length of objective and eye lens of a microscope are 4 cm and 8 cm respectively. If the least distance of distinct vision is 24 cm and object distance is 4.5 cm from the objective lens, then the magnifying power of the microscope will be

The focal lengths of the objective and the eye-piece of an astronomical telescope are 0.25 m and 0.02m, respectively. The telescope is adjusted to view an object at a distance of 1.5 m from the objective, the final image being 0.25 m from the eye of the observer. Calculate the length of the telescope and the magnification produced by it.

A compound microscope has an eyepiece of focal length 5 cm and the distance between its objective and the eye piece is 20 cm. What is the distance of the real intermediate image from the objective, if the final iamge seen by the eye is formed at the distance of distinct vision ?

The focal lengths of the objective and the eyepiece of a compound microscope are 1.0 cm and 5.0 cm respectively. An object, placed at a distance of 1.1 cm from the objective, has its final image formed at a distance of 25 cm from the eye. Find the magnifying power of the microscope.

A compound microscope has an objective of focal length 2 cm and eye-piece of focal length 5 cm. The distance between the two lenses is 25 cm. If the final image is at a distance of 25 cm from the eye-piece, find the magnifying power of the microscope. What would be the magnifying power if the microscope were reversed ?

The focal lengths of the objective and the eye-piece of an astronomical telescope are 0.25 m and 0.025 m, respectively. The telescope is focussed on an object 5m from the objective, the final image being formed 0.25 m from the eye of the observer. Calculate the length of the telescope and its magnifying power.