NCERT Class VII Science Solutions: Chapter 15 – Light Part 1

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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:

An image that cannot be obtained on a screen is called virtual image.

As showing in Image is a result for virtual image.

Result for 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

Result for Plane Mirror

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)
Match column 1 with column 2 (Q)

Column I

Column II

A plane mirror

Used as a magnifying glass.

A convex mirror

Can form image of objects spread over a large area?

A convex lens

Used by dentists to see enlarged image of teeth.

A concave mirror

The image is always inverted and magnified.

A concave lens

The 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)
Match column 1 with column 2 (ans)

Column I

Column II

A plane mirror

The image is erect and of the same size as the object.

A convex mirror

Can form image of objects spread over a large area?

A convex lens

Used as a magnifying glass.

A concave mirror

Used by dentists to see enlarged image of teeth.

A concave lens

The image is erect and smaller in size than the object.