Angle Eyepiece

Anyone good with physics that could help me?

I could really use any help on this problem that anyone could give me. Thanks in advance. I will give 10 points if anyone can help me out.

A microscope has an objective lens (with a focal length of 16.22 mm and an eyepiece with a focal length of 9.20 mm). With the length of the barrel set at 27.0 cm, the diameter of a red blood cell's image subtends an angle of 1.43 mrad with the eye. If the final image distance is 27.0 cm from the eyepiece, what is the actual diameter of the red blood cell (in µm)?

m =[ L / fo ] * [ 1 +D / fe]

Where D is the distance of distinct vision = 270 mm
Using the given values

m = 270 mm / 16.22 mm { 1 + 270 mm / 9.2 mm}

m = 505.17= size of the image / size of the object.

505.17=( 27 cm * 1.43 x 10^-3 ) / ( size of the object.)

size of the object = 27 cm x 1.43 x 10^-3 / 505.17= 7.64297e-5 cm

=0. 764297µ m

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