please help 1-The distance between the lenses in a compound microscope is 15 cm.
ID: 1502209 • Letter: P
Question
please help
1-The distance between the lenses in a compound microscope is 15 cm. The focal length of the objective is 1.0 cm. If the microscope is to provide an angular magnification of 81 when used by a person with a normal near point (25 cm from the eye), what must be the focal length of the eyepiece?
2-One of my telescopes is a 90 mm diameter Meade ETX, a type of Maksutov-Cassegrain. It has an objective with a focal length of 1250 mm. Even though the telescope is a reflecting telescope (uses a mirror instead of a lens as the objective), the formula for the angular magnification is the same. I have two eyepieces, on with a focal length of 26 mm and one with a focal length of 12.4 mm. (a) What is the magnification when the 26-mm eyepiece is used? 1 (b) What is the magnification when the 12.4-mm eyepiece is used? 5-A slide projector has a converging lens whose focal length is 111.00 mm. (a) How far from the lens must the screen be located if a slide is placed 113 mm from the lens?
Explanation / Answer
the angular magnification of compound micro scope is
M =- L/ fo ( 25 cm/ fe)
-81 = - 15 cm/1.0cm ( 25 cm/ fe)
fe = 4.62 cm
As per guide liens I did first problem , please post remaining post next time
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