A light ray strikes a plane mirror at an angle to its surface. Which of the following is equal to the angle of reflection of the ray?The angle between the surface and the reflected rayThe angle between the incident and reflected raysThe angle between the surface and the normalThe angle between the reflected ray and the normal2A ray of light is normally incident onto a mirror (in other words, it is incident along the normal). Which of the following statements does NOT apply to this situation?The Law of Reflection will apply when the ray reflects from the surfaceThe normal is at right angles to the surface of the mirrorIts angle of reflection is equal to 90°Its angle of incidence is equal to 0°3Which of the following statements does NOT apply to wavefront diagrams?Wavefront diagrams can be used to describe the reflection of any type of waveIf the speed of a wave is constant and its frequency increases, the distance between its wavefronts will decreaseThe distance between two adjacent wavefronts is equal to the wavelength of the waveWavefronts are always drawn parallel to the direction in which the wave is travelling4A sound wave strikes a flat brick wall. The angle between the incident wave and the wall is 30°. What is the angle of reflection of this wave?60°30°150°90°5The angle of incidence of a light ray onto a plane mirror is 20°. What is the angle of reflection of the ray?70°0°20°40°6A ray of light is travelling from glass into air at an angle of incidence of 40°. The critical angle for the glass-air boundary is 41°. What will happen to the ray of light when it strikes the boundary?It will not be refracted or reflected and will continue in its original pathIt will undergo total internal reflectionIt will pass out of the glass and refract away from the normalIt will travel along the boundary (interface) between the air and the glass (in other words, its angle of refraction will be equal to 90°)7A ray of light is travelling from water into air. The critical angle for the water-air boundary is 49°. For which of the following angles of incidence will this ray undergo total internal reflection?50°0°49°48°
Question
A light ray strikes a plane mirror at an angle to its surface. Which of the following is equal to the angle of reflection of the ray?The angle between the surface and the reflected rayThe angle between the incident and reflected raysThe angle between the surface and the normalThe angle between the reflected ray and the normal2A ray of light is normally incident onto a mirror (in other words, it is incident along the normal). Which of the following statements does NOT apply to this situation?The Law of Reflection will apply when the ray reflects from the surfaceThe normal is at right angles to the surface of the mirrorIts angle of reflection is equal to 90°Its angle of incidence is equal to 0°3Which of the following statements does NOT apply to wavefront diagrams?Wavefront diagrams can be used to describe the reflection of any type of waveIf the speed of a wave is constant and its frequency increases, the distance between its wavefronts will decreaseThe distance between two adjacent wavefronts is equal to the wavelength of the waveWavefronts are always drawn parallel to the direction in which the wave is travelling4A sound wave strikes a flat brick wall. The angle between the incident wave and the wall is 30°. What is the angle of reflection of this wave?60°30°150°90°5The angle of incidence of a light ray onto a plane mirror is 20°. What is the angle of reflection of the ray?70°0°20°40°6A ray of light is travelling from glass into air at an angle of incidence of 40°. The critical angle for the glass-air boundary is 41°. What will happen to the ray of light when it strikes the boundary?It will not be refracted or reflected and will continue in its original pathIt will undergo total internal reflectionIt will pass out of the glass and refract away from the normalIt will travel along the boundary (interface) between the air and the glass (in other words, its angle of refraction will be equal to 90°)7A ray of light is travelling from water into air. The critical angle for the water-air boundary is 49°. For which of the following angles of incidence will this ray undergo total internal reflection?50°0°49°48°
Solution
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The angle between the reflected ray and the normal is equal to the angle of reflection of the ray.
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Its angle of reflection is equal to 90° does NOT apply to this situation. According to the law of reflection, the angle of incidence is equal to the angle of reflection. If the ray of light is incident along the normal, the angle of incidence is 0°, so the angle of reflection is also 0°, not 90°.
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Wavefronts are always drawn parallel to the direction in which the wave is travelling does NOT apply to wavefront diagrams. Wavefronts are perpendicular to the direction of wave propagation.
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The angle of reflection of this wave is 30°. According to the law of reflection, the angle of incidence is equal to the angle of reflection.
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The angle of reflection of the ray is 20°. According to the law of reflection, the angle of incidence is equal to the angle of reflection.
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It will undergo total internal reflection. When the angle of incidence is greater than the critical angle, total internal reflection occurs.
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For an angle of incidence of 50°, this ray will undergo total internal reflection. When the angle of incidence is greater than the critical angle, total internal reflection occurs.
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