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#reflection

3 public questions tagged with this topic.

PHYSICS

Why does the reflected wavefront from a plane surface maintain the same angle as the incident wavefront?

The wave model shows that secondary wavelets from the surface form a reflected wavefront where the angle of incidence equals the angle of reflection due to geometric symmetry.

Ref: NCERT Physics Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII, continuing as per NCERT advisory for 2026-27),Topic: Fundamental laws, definitions and applications as per latest NCERT. The section explains governing laws, formulas like μ₀ = 4π.

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PHYSICS

What ensures that the laws of reflection hold true when derived using the wave model?

The wave model uses secondary wavelets, where the reflected wavefront’s envelope forms when the incident and reflected angles are equal, satisfying geometric congruence.

Ref: NCERT Physics Textbook for Class XI and XII, Chapter: Wave Optics, Topic: Laws of reflection from wave model, secondary wavelets and equal angles. The section explains definitions, governing laws, formulas like μ₀ = 4π × 10⁻⁷ T·m/A, units and illustrative examples.

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PHYSICS

What is the phase change when a longitudinal wave reflects off a rigid boundary?

For a longitudinal wave, a rigid boundary (fixed end) causes a compression to reflect as a compression, resulting in no phase change (0 radians), unlike transverse waves which invert.

Ref: NCERT Physics Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII, continuing as per NCERT advisory for 2026-27),Topic: Fundamental laws, definitions and applications as per latest NCERT. The section explains governing laws, formulas like μ₀ = 4π.

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