Question

_______ are optical systems, which provide better isolation of spectral energy than the optical filters.

(a) Spectromators

(b) Monochromators

(c) Tocochromators

(d) Baromators

I had been asked this question in homework.

My doubt stems from Methods of Monitoring Foetal Heart Rate topic in portion Foetal Monitoring Instruments of Biomedical Instrumentation

Answer 1

Correct answer is (b) Monochromators

For explanation: Monochromators are optical systems, which provide better isolation of spectral energy than the optical filters, and are therefore preferred where it is required to isolate narrow bands of radiant energy. Monochromators usually incorporate a small glass of quartz prism or a diffraction grating system as the dispersing media.