Light CLASS 7 NCERT

 

Worksheet 1

Light

Section A: Objective Questions

  1. Fill in the blanks:

    • Light travels in a ________ line.
    • The angle of incidence is ________ to the angle of reflection.
    • A plane mirror forms an image that is ________ in size to the object.

  2. True or False:

    • A concave mirror always forms a virtual image. (_____)
    • The image formed by a plane mirror is laterally inverted. (_____)
    • Light cannot travel through a vacuum. (_____)

  3. Match the Following:

    Column AColumn B
    Convex lens    Converging lens
    Concave mirror    Diverging light rays
    Plane mirror    Virtual image

  4. Multiple Choice Questions (MCQs):

    • What is the phenomenon of light bouncing off a surface called?
      a) Refraction
      b) Reflection
      c) Absorption
      d) Dispersion
    • Which part of the eye controls the amount of light entering it?
      a) Cornea
      b) Retina
      c) Pupil
      d) Lens

Section B: Short Answer Questions

  1. State the laws of reflection.
  2. What are the characteristics of the image formed by a plane mirror?
  3. Explain why we cannot see clearly through frosted glass.

Section C: Diagram-Based Questions

  1. Draw a labeled diagram to show the reflection of light from a plane mirror.
  2. Draw and explain the path of light through a convex lens when parallel rays strike it.

Section D: Long Answer Questions

  1. Explain the difference between regular and diffused reflection with examples.
  2. Describe how a concave mirror is used in torches and headlights.

Worksheet 2

Light 

Section A: Objective Questions

  1. Fill in the blanks:

    • The ________ of light is responsible for the formation of shadows.
    • A convex mirror always forms a ________ and ________ image.
    • The ________ is the natural optical device in the human body that focuses light.

  2. True or False:

    • A convex lens can form both real and virtual images. (_____)
    • In diffused reflection, the laws of reflection are not obeyed. (_____)
    • The angle of reflection depends on the material of the reflecting surface. (_____)

  3. Match the Following:

    Column AColumn B
    Reflection of light      Change in direction of light
    Convex mirror      Rearview mirrors
    Concave lens      Diverging lens

  4. Choose the Correct Answer:

    • What is the nature of the image formed by a plane mirror?
      a) Real and inverted
      b) Virtual and erect
      c) Real and diminished
      d) Virtual and enlarged

    • Which type of mirror is used as a shaving mirror?
      a) Plane mirror
      b) Convex mirror
      c) Concave mirror
      d) None of these

Section B: Short Answer Questions

  1. Define lateral inversion. Explain with an example.
  2. How does light behave when it passes from air to water?
  3. Mention two uses of convex lenses in everyday life.

Section C: Diagram-Based Questions

  1. Draw a labeled diagram of a concave mirror showing the reflection of parallel rays of light.
  2. Illustrate and explain the image formation by a convex mirror for an object placed at infinity.

Section D: Long Answer Questions

  1. Explain the differences between a concave and a convex mirror with examples of their applications.
  2. Describe how the human eye works as an optical device, including the role of the cornea, lens, and retina.

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