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Olympiad (Class 7) Light — practice questions

Explore 54 free Light questions in Olympiad (Class 7) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Light questions and exercises with answers

Showing questions 1–30 of 54.

A ray hits a plane mirror at incidence angle 35°. What is the angle between incident and reflected rays?Read the answer and worked solution →The angle of reflection is measured between the reflected ray and which line?Read the answer and worked solution →A light ray hits a plane mirror and makes an angle of 30 degrees with the mirror surface. What is the angle of reflection?Read the answer and worked solution →A ray of light falls on a plane mirror along the normal. What is the angle of reflection?Read the answer and worked solution →Reflection from a very smooth surface such as a polished mirror is called what?Read the answer and worked solution →A rough wall does not show your face, yet you can see the wall from any side. Why?Read the answer and worked solution →Most objects around us become visible to our eyes mainly because of which process?Read the answer and worked solution →How must three plane mirrors be placed to make a simple retroreflector?Read the answer and worked solution →Two plane mirrors are placed exactly face to face. How many images can ideally be seen?Read the answer and worked solution →Which kind of mirror always gives a virtual, erect image of the same size as the object?Read the answer and worked solution →A lamp stands 3 m in front of a plane mirror. How far is the lamp from its reflection?Read the answer and worked solution →You walk toward a plane mirror at 2 m/s. At what speed does your reflection approach you?Read the answer and worked solution →You stand 1.5 m from a plane mirror and then step back 1 m. How far are you now from your reflection?Read the answer and worked solution →What is the focal length of a plane mirror?Read the answer and worked solution →Where does the reflection of an object appear in a plane mirror?Read the answer and worked solution →What are the features of the optical image formed by a convex mirror?Read the answer and worked solution →Why can the optical image formed by a convex mirror not be caught on a screen?Read the answer and worked solution →A parallel beam of light falls on a mirror and spreads out after reflection. The mirror is what type?Read the answer and worked solution →Which type of mirror is typically fitted as a car's passenger-side mirror?Read the answer and worked solution →A driver sees vehicles behind as smaller but covers a wider area. This happens because the mirror is what?Read the answer and worked solution →Which mirror is used in torches and headlamps to send light out in a beam?Read the answer and worked solution →Which mirror gives a magnified view of the face for shaving or applying make-up?Read the answer and worked solution →Which type of mirror is used in reflecting telescopes to gather faint light?Read the answer and worked solution →An object moves farther from a convex mirror. How do the image size and image position change?Read the answer and worked solution →Which mirror reflects light inward toward a single focal point?Read the answer and worked solution →Why are mirrors placed at corridor corners in hospitals and stores usually convex?Read the answer and worked solution →A shadow is formed when light from a source is what?Read the answer and worked solution →A tiny point source of light lights up a small ball. What kind of shadow does it cast?Read the answer and worked solution →With a large lamp as source, which shadow region gets light from only some parts of the lamp?Read the answer and worked solution →A person standing inside the umbra of an object cannot see which thing?Read the answer and worked solution →

Worked practice questions

A ray hits a plane mirror at incidence angle 35°. What is the angle between incident and reflected rays?

  1. 35°
  2. 110°
  3. 55°
  4. 70°
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Correct answer: D. 70°

The reflected ray makes 35 degrees with the normal on the other side, so the two rays are 35 + 35 = 70 degrees apart.

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The angle of reflection is measured between the reflected ray and which line?

  1. The normal line
  2. The mirror face
  3. The incident ray
  4. The focal axis
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Correct answer: A. The normal line

Both angles of incidence and reflection are measured from the imaginary perpendicular line called the normal at the point of incidence.

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A light ray hits a plane mirror and makes an angle of 30 degrees with the mirror surface. What is the angle of reflection?

  1. 30 degrees
  2. 90 degrees
  3. 120 degrees
  4. 60 degrees
Show answer and solution

Correct answer: D. 60 degrees

The angle with the normal is 90 - 30 = 60 degrees, and the angle of reflection equals the angle of incidence measured from the normal.

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