Two compound microscopes A and B have the following parameters: Microscope A:…
PHYSICS · Subjective · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments
Problem
Two compound microscopes A and B have the following parameters:
Microscope A: objective focal length 0.60cm, eyepiece focal length 3.0cm, tube length 18cm.
Microscope B: objective focal length 0.40cm, eyepiece focal length 5.0cm, tube length also 18cm. The final images are formed at infinity.
(i) Calculate the overall magnifying power of each microscope.
(ii) The tube length of microscope B is now increased to 20cm while keeping its lenses unchanged. Compute the percentage increase in its magnifying power.
(iii) Based on your results, discuss which microscope design (short-focus objective with longer tube versus relatively longer-focus objective) is more advantageous when very high magnification is required, mentioning two practical considerations.