Light from the sun is falling directly upon a Ramsden eye-piece consisting of lenses of focal length `0.05`m. Find the position of the image formed and trace the path of rays through the eye-piece.

The distance between the eye lens and cross wire in a Ramsden eye-piece, which has a field lens of focal length 1.2 cm is

A telescope has an objective of focal length 1.44m and an eye-piece of focal length 0.06m. What is the separation between the objective and the eye piece?

An astronomical telescope consisting of an objective of focal length 60cm and eye-piece of focal length 3 cm is focused on the moon so that the final image is formed at least distance vision, i.e. 25 cm from the eye-piece piece. Assuming the angular diameter of moon as 1//2^(@) at the objective, calculate (a) angular size and (b) lenear size of image seen through the telescope.

A refracting telescope has an objective of focal length 1 m and an eye-piece of focal length 20 cm. A real image of the sun 10 cm in diameter is formed on a screen 24 cm from the eye-piece. What angle does the sun subtend at the objective?

A compound microscope consists of an objective lens with focal length 1.0 cm and eye piece of the focal length 2.0 cm and a tube 20 cm from eye lens. Now final image is formed at the near point of eye, so find the magnifying power of 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 ?

A small telescope has an objective lens of focal length 144 cm and an eye-piece of focal length 6.0 cm . What is the magnifying power of the telescope ? What is the separation between the objective and the eye-piece ?