Key Terms: Lens Formula, Spherical Lenses, Concave Lens, Convex Lens, Focal Length, Magnification, Power of a Lens, Light Rays

Magnification of a lens is the ratio of the height of the image formed by the lens to the height of the object. Magnification is equal to the ratio of the image distance to that of the distance of the object. It is denoted by m. The formula of magnification using lens formula is:

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Example: What is the distance of the image from the lens if the object is 6 cm away from a convex lens of focal length 3 cm?

Ans. Magnification is defined as the ratio of the height of the image height to the height of the object. In other words, it is the ratio of image distance to object distance. Magnification is denoted by the letter 'm'. The formula to find the magnification of a lens is given as follows:

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Lens is a part of a transparent thick glass bounded by two spherical surfaces. Spherical Lenses are optical instruments that cause light rays to converge or diverge depending on the type. Spherical lenses are divided into two types namely Concave Lens and Convex Lens.

Ans. A Lens is a transparent material (glass) that has two surfaces, in which one of the surfaces or both surfaces are spherical. Lenses may be called magnifying glasses which have curved sides. Lenses are basically of two types which are Concave lenses and Convex lenses.

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Spherical Lens is a piece of transparent optical material with two spherical surfaces to refract light rays. They either converge or diverge light rays to form an image. Spherical Lenses can be classified into major types namely

Lens Formula is an equation that gives the relationship between the focal length, image distance, and object distance. Lens Formula is given as

Here, v is the distance of the image from the lens, u is the distance of the object from the lens, and f is the focal length of the lens.

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Jul 16, 2014 — On a basic stereo microscope setup, to determine total magnification simply look at the magnification on the eyepiece and on the zoom knob.

Ques. What is the image distance if the distance of an object of height 6 cm from a concave lens is 20 cm? The focal length is given as 10 cm. (3 Marks)

A positive (+) sign of magnification indicates that the image is virtual and erect, whereas a negative (-) sign indicates that the image is real and inverted.

Ans. Object Distance is the distance of the object which is measured from the optical center of the lens. The distance of an object from the optical center is called object distance. The object distance is denoted by u.

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Ans. The lens formula is applicable in all situations related to spherical lenses with appropriate sign conventions. Thus, the lens formula is used to find the distance of an image whether it is a real or virtual image.

Ans. Both real and virtual images are formed by convex lenses, therefore the convex lens can produce either positive or negative. Real images always have negative Magnification whereas virtual images always have positive Magnification.

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Ques. What will be the image distance if the distance of the object placed in front of a convex lens having a focal length of 10 cm is 15 cm? (3 Marks)

The SI unit of Power of a Lens is Dioptre represented by the letter 'D'. A lens with a focal length of one meter has a power of one dioptre. Convex lenses have positive power, while concave lenses have negative power.

Example: What will be the height of the image if the object distance is 20 cm, the image distance is 60 cm, and the height of the object is 5 cm?

Lens formula can be used in all situations related to spherical mirrors with appropriate sign conventions. The images which are formed by the Concave and the Convex lens can be real or virtual as well as they may have different sizes.

Lens Formula states the relationship between the distance of an object, the distance of an image, and the focal length of the lens in Optics. Lens formula is applicable to both concave and convex lenses. It is used to find image distance for both real images or virtual images.

Power of a Lens is the degree of convergence or divergence of the light rays falling on a lens. The degree of convergence or divergence of the light rays depends upon the focal length of the lens. The power of the concave lens is negative, whereas the power of the convex lens can be positive. Therefore, the power of a lens is the reciprocal of the focal length of the lens used.

Ans. Power of a Lens is defined as the measure of the degree of divergence or convergence of a beam of light caused by a lens. The convergence and divergence of a lens are determined by the focal length of a lens. Thus, the power of a lens is reciprocal to its focal length.

Ans. The focal length can be defined as the distance of the Principal Focus from the optical center of a lens. Focal length is denoted by f and is measured in meters (m).

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