Understanding Magnification of a Lens: Formula and Concepts for Class 10 Optics

Magnification of a Lens

MAGNIFICATION OF A LENS

Like spherical mirrors, we have magnification for spherical lenses. Spherical lenses produce magnification and it is defined as the ratio of the height of the image to the height of an object. Magnification is denoted by the letter ‘m’. If height of the object is h and height of the image is h´, the magnification produced by lens is,

Also it is related to the distance of the object (u) and the distance of the image (v) as follows:

If the magnification is greater than 1, then we get an enlarged image. On the other hand, if the magnification is less than 1, then we get a diminished image.

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Context: 10th Science : Chapter 2 : Optics : Magnification of a Lens

Lens Formula Explained: A Key Concept in 10th Science Optics

Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail

Lens Formula

10th Science : Chapter 2 : Optics : Lens Formula

Defining the Lens Formula

LENS FORMULA

Like spherical mirrors, we have lens formula for spherical lenses. The lens formula gives the relationship among distance of the object (u), distance of the image (v) and the focal length (f) of the lens. It is expressed as

$$ \frac{1}{f} = \frac{1}{v} - \frac{1}{u} $$

Application and Key Considerations

It is applicable to both convex and concave lenses. We need to give an at most care while solving numerical problems related to lenses in taking proper signs of different quantities.