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NCERT solutions Science Textbook for Class 7 chapter 15 Light

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Chapter 15 - Light

Pages 189 - 190

Fill in the blanks:

An image that cannot be obtained on a screen is called ________

Q 1.1 | Page 189 |

Fill in the blanks:

Image formed by a convex ________ is always virtual and smaller in size.

Q 1.2 | Page 189 |

Fill in the blanks:

An image formed by a ________ mirror is always of the same size as that of the object.

Q 1.3 | Page 189 |

Fill in the blanks:

An image which can be obtained on a screen is called a _______image.

Q 1.4 | Page 189 |

Fill in the blanks:

An image formed by a concave ________cannot be obtained on a screen.

Q 1.5 | Page 189 |

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

We can obtain an enlarged and erect image by a convex mirror. (T/F)

Q 2.1 | Page 189 |

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

A concave lens always forms a virtual image. (T/F)

Q 2.2 | Page 189 |

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

We can obtain a real, enlarged and inverted image by a concave mirror. (T/F)

Q 2.3 | Page 189 |

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

A real image cannot be obtained on a screen. (T/F)

Q 2.4 | Page 189 |

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

A concave mirror always forms a real image. (T/F)

Q 2.5 | Page 189 |

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

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
Q 3 | Page 189 |

State the characteristics of the image formed by a plane mirror.

Q 4 | Page 189 |

Find out the letters of English alphabet or any other language known to you in which the image formed in a plane mirror appears exactly like the letter itself. Discuss your findings.

Q 5 | Page 189 |

What is a virtual image? Give one situation where a virtual image is formed.

Q 6 | Page 190 |

State two differences between a convex and a concave lens.

Q 7 | Page 190 |

Give one use each of a concave and a convex mirror.

Q 8 | Page 190 |

Which type of mirror can form a real image?

Q 9 | Page 190 |

Which type of lens forms always a virtual image?

Q 10 | Page 190 |

A virtual image larger than the object can be produced by a

(1) concave lens

(2) concave mirror

(3) convex mirror

(4) plane mirror

Q 11 | Page 190 |

David is observing his image in a plane mirror. The distance between the mirror and his image is 4 m. If he moves 1 m towards the mirror, then the distance between David and his image will be

(1) 3 m

(2) 5 m

(3) 6 m

(4) 8 m

Q 12 | Page 190 |

The rear view mirror of a car is a plane mirror. A driver is reversing his car at a speed of 2 m/s. The driver sees in his rear view mirror the image of truck parked behind his car. The speed at which the image of the truck appears to approach the driver will be

(1) 1 m/s

(2) 2 m/s

(3) 4 m/s

(4) 8 m/s

Q 13 | Page 190 |

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