NCERT Solutions Class 7 Science Chapter 15 Light
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Questions and Answers

What is an image that cannot be obtained on a screen called?

  • Inverted image
  • Real image
  • Enlarged image
  • Virtual image (correct)

What type of mirror always forms a virtual and smaller sized image?

  • Plane mirror
  • Concave mirror
  • Convex mirror (correct)
  • Magnifying mirror

What is the characteristic of an image formed by a plane mirror?

  • Different shape
  • Inverted orientation
  • Enlarged size
  • Same size as the object (correct)

What is an image that can be obtained on a screen called?

<p>Real image (C)</p> Signup and view all the answers

Which type of mirror cannot form an image that can be obtained on a screen?

<p>Concave mirror (C)</p> Signup and view all the answers

Which of the following statements is true about the image formed by a concave lens?

<p>It always forms a virtual image. (B)</p> Signup and view all the answers

What is the main difference between a convex mirror and a concave mirror?

<p>A convex mirror can form both real and virtual images, while a concave mirror only forms virtual images. (B)</p> Signup and view all the answers

In which situation can a virtual image be formed?

<p>When using a convex lens to view an object placed within its focal point. (D)</p> Signup and view all the answers

Which type of mirror/lens can produce a virtual image larger than the object?

<p>Concave mirror (A)</p> Signup and view all the answers

When observing his image in a plane mirror, David notices that the distance between him and the mirror is 3 m. If he moves 1 m towards the mirror, what will be the new distance between David and his image?

<p>2 m (A)</p> Signup and view all the answers

Flashcards

Virtual image

An image that cannot be projected onto a screen. It appears to be behind the mirror or lens and cannot be caught on a screen.

Convex mirror

A curved mirror that bulges outwards. It always produces a smaller and upright image, regardless of the object's position.

Image in a plane mirror

The image formed by a plane mirror is the same size as the object and appears to be behind the mirror.

Real image

An image that can be projected onto a screen. It is formed by the actual convergence of light rays.

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Concave mirror

A concave mirror can only produce a virtual image when the object is placed very close to the mirror. Otherwise, it forms a real image.

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Image formed by a concave lens

A concave lens always forms a virtual image, meaning the image cannot be projected onto a screen. It always appears upright and smaller than the object.

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Convex vs. Concave mirrors

Convex mirror - bulges outwards, produces only virtual images. Concave mirror - curves inwards, can produce both real and virtual images depending on the object's position.

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Virtual image formation with convex lens

When an object is placed within the focal point of a convex lens, the light rays diverge as if coming from a point behind the lens, forming a virtual image.

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Magnification with concave mirror

A concave mirror can produce a virtual image that is larger than the object when the object is placed within the focal point.

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Distance and image in a plane mirror

The distance between David and his image will be halved as he moves closer to the mirror. So, the new distance will be 2 meters.

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Study Notes

Mirror and Image Concepts

  • An image that cannot be obtained on a screen is called a virtual image.
  • A plane mirror always forms a virtual and smaller sized image.

Characteristics of Images

  • An image formed by a plane mirror is virtual and smaller.
  • An image that can be obtained on a screen is called a real image.

Mirror Types and Images

  • A concave mirror cannot form an image that can be obtained on a screen (real image).
  • A convex mirror and a concave mirror differ in that a convex mirror has a curved outward shape, while a concave mirror has a curved inward shape.

Image Formation Situations

  • A virtual image can be formed when an object is placed inside the focal length of a mirror or lens.
  • A concave lens can produce a virtual image that is smaller than the object.
  • A convex mirror or a concave lens can produce a virtual image larger than the object.

Image Distance and Movement

  • When an object moves towards a plane mirror, the distance between the object and the image decreases.
  • If David moves 1 m towards the mirror, the new distance between David and his image will be 4 m (initial distance 3 m + 1 m moved towards the mirror).

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Prepare for your Class 7 Science examinations with NCERT solutions for Chapter 15 - Light. Learn about light, reflection, and more to score well in your exams.

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