Lateral shift through parallel slab (t = d sin(i−r)/cos r)
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t = d sin(i−r)/cos r
What each symbol means
| Symbol | What it stands for |
|---|---|
| d | Thickness of parallel-sided slab (m) |
| i | Angle of incidence at first surface (from normal) |
| r | Angle of refraction inside slab (from normal) |
| t | Lateral shift of emergent ray relative to incident line (m) |
When to use this
Standard JEE / NCERT assumptions unless stated (paraxial, thin lens, coherent YDSE sources, etc.).