Question

A standard biological microscope is required to have a magnification of 200X. a. When paired with a 10X eyepiece, what power objective is needed to get this magnification? b. What is the focal length of the objective?

Answer 1

power = 20X

focal length = L/ 20

Step-by-step explanation:

Given data

magnification = 200X

eyepiece = 10X

to find out

power objective is needed and focal length of the objective

solution

we know magnification of microscope M is the product of ( m1 ) magnifying power of object and ( m2 )magnifying power of eyes

that is M = M1 × M2

so M1 = M / M2

put value M = 200 and M2 = 10

M1 = 200/10 = 20

so here power = 20X

and

now we calculate focal length by this formula

M1 = ( L/focal length ) M2

here L is length of tube put all value

200 =( L/focal length ) 10

focal length = L/ 20