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Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 10
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पाठ्यक्रम

Magnification

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Maharashtra State Board: Class 10

Magnification Due to Spherical Lenses

Magnification is the ratio of the height of the image (h2​) to the height of the object (h1 ). It is used to determine the size and nature of the image formed by convex and concave lenses.

`"Magnification" = "Height of the Image"/"Height of the object"`

 \[\mathrm{i.e.~M}=\frac{\mathrm{h}_2}{\mathrm{h}_1}\]

Formula in Terms of Distances: Magnification is also the ratio of the image distance (v) to the object distance (u).

`"Magnification" = "Distance of the Image"/"Distance of the object"`

\[\mathrm{i.e.~M}=\frac{\mathrm{v}}{\mathrm{u}}\]

Interpretation of Magnification Value:

  • M>1 → Enlarged image
  • M<1 → Diminished image
  • M=1 → Same size image

Sign Convention:

  • M>0 → Image is upright (virtual).
  • M<0 → Image is inverted (real).

Video Tutorials

We have provided more than 1 series of video tutorials for some topics to help you get a better understanding of the topic.

Series 1


Series 2


Shaalaa.com | Light Reflection and Refraction part 18 (Maginfication power of Lens)

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Light Reflection and Refraction part 18 (Maginfication power of Lens) [00:04:52]
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Light Reflection and Refraction part 18 (Maginfication power of Lens)
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Light Reflection and Refraction part 19 (Numericals)
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Related QuestionsVIEW ALL [58]

The lens A produces a magnification of, −0.6 whereas lens B produces a magnification of + 0.6.

  1. What is the nature of lens A?
  2. What is the nature of lens B?

What do you understand by the term magnification?

The magnification of an image formed by a lens is −1. If the distance between the object and its image is 60 cm, what is the distance of the object from the optical centre of the lens? Find the nature and focal length of the lens. If the object is displaced 20 cm towards the optical centre of the lens, where would the image be formed and what would be its nature? Draw a ray diagram to justify your answer.

The image formed by a spherical mirror is real, inverted and is of magnification −2. If the image is at a distance of 30 cm from the mirror, where is the object placed? Find the focal length of the mirror. List two characteristics of the image formed if the object is moved 10 cm towards the mirror.

Linear magnification produced by a concave mirror may be:

(a) less than 1 or equal to 1
(b) more than 1 or equal than 1
(c) less than 1, more than 1 or equal to 1
(d) less than 1 or more than 1

If a magnification of, −1 (minus one) is to be obtained by using a converging mirror, then the object has to be placed:

(a) between pole and focus
(b) at the centre of curvature
(c) beyond the centre of curvature
(d) at infinity

The image of a candle flame formed by a lens is obtained on a screen placed on the other side of the lens. If the image is three times the size of the flame and the distance between lens and image is 80 cm, at what distance should the candle be placed from the lens? What is the nature of the image at a distance of 80 cm and the lens?

When an object is placed at a distance of 50 cm from a concave spherical mirror, the magnification produced is, `-1/2`. Where should the object be placed to get a magnification of, `-1/5`? 

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