Which of the following instruments has minimum least count a

Last updated: 6/24/2023

Which of the following instruments has minimum least count a A vernier callipers with 20 divisions on the vernier scale coinciding with 19 main scale divisions b A screw gauge of pitch 1 mm and 100 divisions on the circular scale c A spherometer of pitch 0 1 mm and 100 divisions on the circular scale d An optical instrument that can measure length to within a wavelength CHOL