A biology professor notices a speck on a student's lab report and pulls out her magnifying lens

Question:

A biology professor notices a speck on a student's lab report and pulls out her magnifying lens to investigate. Holding the lens close to her eye, she is surprised to find Pelomyxa palustris, the largest known species of amoeba. 

(a) When observed without magnification at her near point of 28 cm, the amoeba subtends an angle of 0.015 radians. What is the amoeba's length? 

(b) When the image formed by the magnifier is at the professor's near point, the angular magnification is 8.5. How far from the lens is the amoeba?

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