Read Semicircular Optics: Use the Local Radius as Normal
This short read prepares one exact NSEP pattern: refraction through a semicircular sheet. Identify the physical condition before calculating.
Refraction through a Semicircular Sheet is the central idea in this question pattern. Identify the condition in the stem before applying the method below.
Start with the physical model
Read the configuration once, state the conserved quantity or governing law, and mark any changing geometry, sign convention or limiting condition.
Build the relation
The internal rays are parallel. At the curved surface, the local normal is radial, so the incidence there depends on θ.
This range changes if µ changes, hence C.
B is false. Correct A,C,D.
Check before selecting
Check units, sign and one limiting case. A valid result must still fit the original geometry and stated constraint.
OlympIQ exam lens
- ✓Name the governing law before using a formula.
- ✓Keep the stated geometry and direction information explicit.
- ✓Use one unit or limiting-case check.
At the curved face the normal changes point by point, so one incidence angle cannot describe all rays.
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