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An angular magnification (magnifying power) of 30X is desired using an objective of focal length 1.25cm and an eyepiece of focal length 5cm. How will you set up the compound microscope? |
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Answer» Solution :Assume MICROSCOPE in normal use i.E., image at 25 cm. Angular magnification of the eye-piece `=(25)/(5)+1=5` Magnification of the objective `=(30)/(6)=5` `(1)/(5u_(o))-(1)/(u_(o))=(1)/(1.25)` which gives `u_(0) = -1.5 cm, v_(0) = 7.5 cm. |u_(e)|= (25//6) cm = 4.17 cm`. The SEPARATION between the objective and the eye-piece should be `(7.5 + 4.17) cm = 11.67 cm`. Further the object should be placed 1.5 cm from the objective to obtain the desired magnification. |
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