What is the angle between an incident ray and normal?180 degrees90 degreesAngle of incidenceAngle of reflection

If the angle of reflection with the normal is 30 degrees as shown in the figure, what is the angle made by the incident ray with the reflecting surface?

What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray?

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 reflected ray and the normalThe angle between the surface and the reflected rayThe angle between the incident and reflected raysThe angle between the surface 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?Its angle of reflection is equal to 90°Its angle of incidence is equal to 0°The normal is at right angles to the surface of the mirrorThe Law of Reflection will apply when the ray reflects from the surface3Which of the following statements does NOT apply to wavefront diagrams?The distance between two adjacent wavefronts is equal to the wavelength of the waveWavefront 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 decreaseWavefronts 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?90°60°30°150°5The angle of incidence of a light ray onto a plane mirror is 20°.  What is the angle of reflection of the ray?0°70°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 travel along the boundary (interface) between the air and the glass (in other words, its angle of refraction will be equal to 90°)It will undergo total internal reflectionIt will pass out of the glass and refract away from the normalIt will not be refracted or reflected and will continue in its original path7A 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?49°48°50°0°

3.Which of the following best describes the angle of incidence?The angle between the incident ray and the reflected rayThe angle between the refracted ray and the normalThe angle between the incident ray and the normalThe angle between the reflected ray and the normal

A light ray strikes a plane mirror at an angle of 30 degrees to the normal. What isthe angle between the incident ray and the reflected ray?A) 30 degreesB) 60 degreesC) 90 degreesD) 120 degrees