Laws of Reflection
Physics ⇒ Light and Optics
Laws of Reflection starts at 7 and continues till grade 12.
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See sample questions for grade 7
Describe what happens to the direction of a light ray when it strikes a mirror at an angle.
Describe what is meant by the 'normal' in the context of reflection.
Explain the difference between regular and irregular reflection.
Explain why the angle of incidence is always measured from the normal and not from the surface.
A light ray strikes a mirror at an angle of 20° to the normal. What is the total angle between the incident and reflected rays?
A ray of light strikes a mirror at an angle of 35° to the normal. What is the angle between the incident ray and the mirror surface?
A student shines a torch at a mirror and measures the angle of incidence as 25°. What should the angle of reflection be?
Explain why you can see your reflection in a calm lake but not in rough water.
Which of the following best describes regular reflection?
(1) Light is scattered in many directions
(2) Light rays reflect in one direction
(3) No reflection occurs
(4) Light is absorbed by the surface
Which of the following best explains why you cannot see your reflection in a piece of paper?
(1) Paper absorbs all light
(2) Paper reflects light regularly
(3) Paper reflects light irregularly
(4) Paper is transparent
Which of the following is an example of irregular (diffuse) reflection?
(1) Reflection from a mirror
(2) Reflection from a calm pond
(3) Reflection from a rough wall
(4) Reflection from a polished metal
Which of the following is NOT a law of reflection?
(1) The angle of incidence is equal to the angle of reflection.
(2) The incident ray, the reflected ray, and the normal all lie in the same plane.
(3) The angle of incidence is always 90°.
(4) Reflection can occur on both smooth and rough surfaces.
Fill in the blank: The angle of incidence and the angle of reflection are always ________.
Fill in the blank: The angle of reflection is measured from the ________ to the reflected ray.
Fill in the blank: The incident ray, the reflected ray, and the normal all lie in the same ________.
Fill in the blank: The ray that comes from the source of light and strikes the surface is called the ________ ray.
True or False: Reflection of light can only occur on smooth surfaces.
True or False: The angle of incidence and the angle of reflection are measured from the surface of the mirror.
True or False: The incident ray, the reflected ray, and the normal all lie in the same plane.
True or False: The laws of reflection apply to both light and sound waves.
