9 ps light ii ao
TRANSCRIPT
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The incident ray, the reflected ray and the normalline all line in the same plane.
PLANE MIRROR
Ray of incidence
Ray of reflection
Normal line
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The incident ray or ray of incidence refers to thelight ray that is directed towards the plane mirror.
PLANE MIRROR
Ray of incidence
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The normal line refers to an imaginary line that isperpendicular to the plane mirror.
PLANE MIRROR
Normal line
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The reflection ray or ray of reflection refers to theray that is directed away from the plane mirror.
PLANE MIRROR
Ray of reflection
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PLANE MIRROR
Angle of incidence = angle of reflection
i° = r°
i° r°
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PLANE MIRROR
The angle of incident (i°) is the angle between thenormal line and the ray of incidence.
i°
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PLANE MIRROR
r°
The angle of reflection (r°) is the angle between the normal line and the ray of reflection.
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Smooth surfaces like the calm waterallows light to be reflected evenly.
This is known as a specular reflection.
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Rough surfaces like the rippled and paddledwater allows light to be reflected unevenly.
This is known as a diffuse reflection.
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The figure shows a light ray striking a surface of a plane mirror at an angle of 50°.
50°
(a) Determine the angle ofincidence.
(b) Complete the ray ofreflection.
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The figure shows a light ray striking a surface of a plane mirror at an angle of 50°.
50°
(a) Determine the angle ofincidence.
ANSWERThe angle of incidence is betweenthe ray of incidence and thenormal line.
The normal line is perpendicularto the plane mirror.
90° – 50° = 40°
40°
Normal line
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The figure shows a light ray striking a surface of a plane mirror at an angle of 50°.
50°
(b) Draw the ray of reflection.
40° 40°
ANSWERi = 40°
i = r = 40°
Ray of reflection is drawn awayfrom the normal.
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Complete the diagram by sketching reflected rays for an uneven surface.
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Complete the diagram by sketching reflected rays for an uneven surface.
ANSWERThe reflected rays of the incident rays are drawn randomly but the ray isstill a straight line.
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Real Object
Virtual Image
Rays of light do not meetto produce the image.
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3. Upright (normal way up).
1. Same size as the object.
2. Virtual.
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4. Appears located farinside the mirror asobjects are in front.
5. Lateral inversion(reverses left andright).