CAIE IGCSE Physics Plane-mirror Ray Constructions
Practise ruler-and-protractor constructions for reflected rays, observer sightlines and virtual image positions in plane-mirror layouts.
- Syllabus
- 2026–2028
- Course
- Physics 0625
Exam points
- draw straight incident and reflected rays meeting the mirror with equal normal angles
- add arrows in the direction of light travel from the object through reflection to the eye
- extend reflected rays backward with dashed lines to locate their virtual intersection
3.2.1.4—Simple constructions, measurements and question 1
Fig. 7.1 shows a plan view of a room. There is a plane mirror on one wall and a picture across the whole of wall AB.
Fig. 7.1 (plan view)
A person is standing at point X and is looking at the mirror. The person cannot see all of the picture on wall AB reflected in the mirror.
There is a point P on wall AB which is the closest point to A that the person can see reflected in the mirror.
On Fig. 7.1, draw a reflected ray and an incident ray to show the position of the point P.
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