An angular magnification (magnifying power) of 30X is desired using an objective of focal length 1.25cm and an eyepiece of focal length 5cm. How will you set up the compound microscope?

An astronomical refractive telescope has an objective of focal length 20 m and an eyepiece of focal length 2 cm.

A small telescope has an objective lens of focal length 140 cm and an eyepiece of focal length 5.0 cm. what is the separation between the objective lens and the eyepiece?

An astronomical telescope has an objective lens of focal length 20 m and eyepiece of focal length 1 cm. Find the angular magnification of the telescope.

A giant refracting telescope at an observatory has an objective lens of focal length 15m. If an eyepiece of focal length 1.0cm is used, what is the angular magnification of the telescope?

A person with a normal near point (25 cm) using a compound microscope with objective of focal length 8.0 mm and an eyepiece of focal length 2.5cm can bring an object placed at 9.0mm from the objective in sharp focus. What is the separation between the two lenses? Calculate the magnifying power of the microscope.

A small telescope has an objective lens of focal length 140cm and an eyepiece of focal length 5.0cm. What is the magnifying power of the telescope for viewing distant objects when- the final image is formed at the least distance of distinct vision (25cm)?

A small telescope has an objective lens of focal length 140cm and an eyepiece of focal length 5.0cm. What is the magnifying power of the telescope for viewing distant objects when- the telescope is in normal adjustment (i.e., when the final image is at infinity)?