The angle of incidence of a ray of light on a plane mirror is gradually decreased until the light ray is incident perpendicular (normal) to the mirror surface.
To the nearest degree, what is the angle between the incident and reflected rays at this point?
0∘0^\circ0∘
45∘45^\circ45∘
90∘90^\circ90∘
180∘180^\circ180∘
216 exam-style questions on CIE IGCSE Physics 3.2 Light, covering 3.2.1a Reflection of light, 3.2.1b Images in a plane mirror, 3.2.2 Refraction of light, 3.2.2a Refraction of light, 3.2.2b Total internal reflection, 3.2.2c Refractive index and critical angle, 3.2.2d Optical fibres, 3.2.3a Converging and diverging lenses, 3.2.3b Ray diagrams and the nature of images, 3.2.3c Virtual images and the magnifying glass, 3.2.3d Correcting long-sightedness and short-sightedness, and 3.2.4 Dispersion of light. Each one has a worked solution and a mark scheme showing where the marks go.