Tender For supply of physics lab equipment : : - newton s ring apparatus , diffraction grating apparatus is an optical device that separates polychromatic light into its constituent wavelengths by diffraction , a cro experiment setup typically involves connecting the cro to a signal source adjusting the controls to display the signal on the screen , electromagnetic induction is the process where a changing magnetic field induces a voltage in a nearby conductor , lc and lcr circuit kit , lcr resonance kit , helmholtz coil setup , optical fiber experiment kit