A student has to observe a permanent slide of binary fission in amoeba. Find the correct sequence of steps given below for focusing the object under a microscope.

(a) Place the slide on the stage, look through the eye-piece and adjust the mirror to get proper illumination.

(b) Focus the slide sharp using fine adjustment screw

(c) Look through the eye-piece and raise the objective lens using coarse adjustment screw till the object is focused.

(d) Look through the eye-piece and move the slide till the object is visible.

• d, c, b, a

• a, b, d, c

• a, d, c, b

• a, c, d, b