List of top Zoology Questions on Basic principles of cellular microscopy asked in GATE XL

What will be the value of the Numerical Aperture (NA), if the half aperture angle is 58° and oil-immersed objective is used for the process of light microscopy? (Answer up to 1 decimal place)
Which of the immune cells listed below are agranular?
P. Eosinophils
Q. Mast cells
R. Monocytes
S. T-cells