NCERT Class VII Science Solutions: Chapter 15 – Light Part 1 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 1:

Fill in the blanks:

  1. An image that cannot be obtained on a screen is called ________.
  2. Image formed by a convex ________ is always virtual and smaller in size.
  3. An image formed by a ________ mirror is always of the same size as that of the object.
  4. An image which can be obtained on a screen is called a ________ image.
  5. An image formed by a concave ________ cannot be obtained on a screen.

Answer:

  1. An image that cannot be obtained on a screen is called virtual image.
As Showing in Image is a Result for Virtual Image
  1. Image formed by a convex mirror is always virtual and smaller in size.
  2. An image formed by a plane mirror is always of the same size as that of the object.
As Showing in Image is a Result for Plane Mirror
  1. An image which can be obtained on a screen is called a real image.
  2. An image formed by a concave lens cannot be obtained on a screen.

Question 2:

Mark ‘T’ if the statement is true and ‘F’ if it is false:

  1. We can obtain an enlarged and erect image by a convex mirror. (T/F)
  2. A concave lens always form a virtual image. (T/F)
  3. We can obtain a real, enlarged and inverted image by a concave mirror. (T/F)
  4. A real image cannot be obtained on a screen. (T/F)
  5. A concave mirror always form a real image. (T/F)

Answer:

  1. We can obtain an enlarged and erect image by a convex mirror. (False)
  2. A concave lens always form a virtual image. (True)
  3. We can obtain a real, enlarged and inverted image by a concave mirror. (True)
  4. A real image cannot be obtained on a screen. (False)
  5. A concave mirror always form a real image. (False)

Question 3:

Match the items given in Column I with one or more items of Column II.

Match Column 1 with Column 2 (Q)
Column IColumn II
A plane mirrorUsed as a magnifying glass.
A convex mirrorCan form image of objects spread over a large area?
A convex lensUsed by dentists to see enlarged image of teeth.
A concave mirrorThe image is always inverted and magnified.
A concave lensThe image is erect and of the same size as the object.
The image is erect and smaller in size than the object.

Answer:

Match Column 1 with Column 2 (Ans)
Column IColumn II
A plane mirrorThe image is erect and of the same size as the object.
A convex mirrorCan form image of objects spread over a large area?
A convex lensUsed as a magnifying glass.
A concave mirrorUsed by dentists to see enlarged image of teeth.
A concave lensThe image is erect and smaller in size than the object.

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