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Identify the rays PE,EF,FS and angles r,D,e mentioned in the diagram.
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a) Incident ray - PEAn incident ray is a ray of light that strikes a surface. The angle between this ray and the perpendicular or normal to the surface is the angle of incidence.b) Refracted ray - EFA refracted ray is a ray which has entered a medium and bent either away from the normal or towards the normal depending on the density of the new medium in comparison to the old one.c) Emergent ray - FSThe emergent ray is the ray of light which passes through a denser medium(glass) to a rarer medium(air).d) Angle of refraction - ∠rAngle of refraction is defined as the angle between the normal and the refracted ray.e) Angle of deviation - ∠DThe angle of deviation through a triangular prism is defined as the angle between the incident ray and the emerging ray.f) Angle of emergence - ∠eAngle of emergence is defined as the angle between the normal and the emergent ray.
a) Incident ray - PE
An incident ray is a ray of light that strikes a surface. The angle between this ray and the perpendicular or normal to the surface is the angle of incidence.
b) Refracted ray - EF
A refracted ray is a ray which has entered a medium and bent either away from the normal or towards the normal depending on the density of the new medium in comparison to the old one.
c) Emergent ray - FS
The emergent ray is the ray of light which passes through a denser medium(glass) to a rarer medium(air).
d) Angle of refraction - ∠r
Angle of refraction is defined as the angle between the normal and the refracted ray.
e) Angle of deviation - ∠D
The angle of deviation through a triangular prism is defined as the angle between the incident ray and the emerging ray.
f) Angle of emergence - ∠e
Angle of emergence is defined as the angle between the normal and the emergent ray.
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Q1
Identify the rays PE,EF,FS and angles r,D,e mentioned in the diagram.
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Q2
In the following ray diagram the correctly marked angle are :
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Q3
In the given figure , line DE || line GF ray EG and ray FG are bisectors of ∠DEF and ∠DFM respectively.Prove that, (i) ∠DEG=12∠EDF
(ii) EF=FG
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Q4
After tracing the path of a ray of light through a glass prism a student marked the angle of incidence (∠i), angle of refraction (∠ r) angle of emergence (∠e) and the angle of deviation (∠D) as shown in the diagram. The correctly marked angles are:
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Q5
In the adjacent diagram, AO is a ray of light incident on a rectangular glass slab.
(a) Complete the path of the ray till it emerges out of the slab.
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(c) Mark angle of emergence by the letter e. How are the angles i and e related ?
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(b) In the diagram, mark the angle of incidence (i) and the angle of refraction (r) at the first interface. How is the refractive index of glass related to the angles i and r ?
(c) Mark angle of emergence by the letter e. How are the angles i and e related ?
(d) Which two rays are parallel to each other ?
(e) Indicate in the diagram the lateral displacement between the emergent ray and the incident ray. State one factor that affects the lateral displacement.
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