  As a Near-IR instrument to PRL's upcoming 2.5 m telescope, NISP is designed
indigeniously at PRL to serve as a multifaceted instrument. Optical, Mechanical
and Electronics subsystems are being designed and developed in-house at PRL. It
will consist of imaging, spectroscopy and imaging-polarimetry mode in the
wavelength bands Y, J, H, Ks i.e. 0.8 - 2.5 micron. The detector is an 2K x 2K
H2RG (MCT) array detector from Teledyne, which will give a large FOV of 10' x
10' in the imaging mode. Spectroscopic modes with resolving power of R ~ 3000,
will be achieved using grisms. Spectroscopy will be available in single order
and a cross-dispersed mode shall be planned for simultaneous spectra. The
instrument enables multi-wavelength imaging-polarimetry using Wedged-Double
Wollaston (WeDoWo) prisms to get single shot Stokes parameters (I, Q, U) for
linear polarisation simultaneously, thus increasing the efficiency of
polarisation measurements and reducing observation time.
