# Question: Two lenses of focal length 0 45 cm and 0 35 cm

Two lenses of focal length 0.45 cm and 0.35 cm are available for a compound microscope using an eyepiece of focal length of 3.0 cm, and the distance between the lenses has to be 15 cm.

(a) Which lens should be used as the objective: (1) the one with the longer focal length, (2) the one with the shorter focal length, or (3) either?

(b) What are the two possible total magnifications of the microscope?

(a) Which lens should be used as the objective: (1) the one with the longer focal length, (2) the one with the shorter focal length, or (3) either?

(b) What are the two possible total magnifications of the microscope?

## Answer to relevant Questions

A – 150 x microscope has an eyepiece whose focal length is 4.4 cm. If the distance between the lenses is 20 cm, find the focal length of the objective. An astronomical telescope has an objective and an eyepiece whose focal lengths are 60 cm and 15 cm, respectively. What are the telescope’s (a) Magnifying power and (b) Length? You are given two objectives and two eyepieces and are instructed to make a telescope with them. The focal lengths of the objectives are 60.0 cm and 40.0 cm, and the focal lengths of the eyepieces are 0.90 cm and 0.80 cm. ...Some African tribes people claim to be able to see the moons of Jupiter with the unaided eye. If two moons of Jupiter are at a minimum distance of 3.1 X 108 km away from Earth and at a maximum separation distance of 3.0 X ...Referring to Fig. 25.24, show that the magnifying power of a magnifying glass held at a distance d from the eye is given by when the actual object is located at the near point (25 cm).Post your question