A biology laboratory requires a compound microscope that provides an overall…
PHYSICS · Subjective · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments
Problem
A biology laboratory requires a compound microscope that provides an overall magnifying power of 600 under normal adjustment. The available eyepiece has a focal length of 2.5cm and the mechanical tube length that can be accommodated is 15cm.
(i) Calculate the focal length that the objective lens should have so that the desired magnification is achieved.
(ii) If the same objective is used with an eyepiece of focal length 5.0cm keeping the tube length unchanged, by what factor will the overall magnification change?