Experimental Mapping of Blackbody Radiation Spectrum

Ultraviolet (UV): Short wavelengths encounter the highest refractive index ($n_{\text{UV}}$) and suffer the largest angle of deviation ($\delta_{\text{max}}$) , bending steepest downward toward the prism base.
Infrared (IR): Long wavelengths encounter the lowest refractive index ($n_{\text{IR}}$) and suffer the minimum angle of deviation ($\delta_{\text{min}}$) , remaining along the upper optical flank.
Optical Clearness: Rock salt ($\text{NaCl}$) maintains high transmission from $0.2\,\mu\text{m}$ (UV) through the entire visible range and out to $16.0\,\mu\text{m}$ (Far-IR).

Virtual Laboratory: Féry's Cavity, Rock Salt Spectrometry, Langley Bolometer & Planck Verification

🔥 Furnace Temperature Controller (T) 1400 K

800 K 2000 K

Wien's Peak: λ_max ≈ 2070 nm | Glow: Orange Incandescent

🛰️ Carriage Scanner & Data Export

200 nm

Step 6 Active: Drag slider to sweep the detector carriage, or click Download CSV for lab assignments.

Step 1: Féry's Blackbody Enclosure Cavity Geometry