explain with an activity the nature of image formed by a convex lens
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Answer:
Images Formed by Lenses
A lens is a part of a transparent thick glass which is bounded by two spherical surfaces. It is an optical device through which the rays of light converge or diverge before transmitting.
Types of Images Formed by Lenses
Lenses are of two kinds: Convex Lenses and Concave Lenses.
Convex Lenses
A convex lens is thicker in the middle and thinner at the edges. A convex lens is also known as a “biconvex lens” because of two spherical surfaces bulging outwards.
Images Formed By Lenses
Convex lenses include lenses that are plano-convex (i.e. these lenses are flat on one side and bulged outward on the other), and convex meniscus (i.e. these lenses are curved inward on one side and on the outer side it’s curved more strongly).
Concave Lenses
A concave lens is thicker at the edges and thinner in the middle. A concave lens is also known as a “biconcave lens” because of two spherical surfaces bulging inwards.
Concave lenses include lenses like plano-concave (i.e. these lenses are flat on one side and curved inward on the other), and concave meniscus (i.e. these lenses are curved inward on one side and on the outer side it’s curved less strongly).
Image Formation by Concave Lens
In case of the concave lens, we always get erect images, diminished images and virtual images.
Images Formed By Lenses
Object location Image location Image nature Image size
Infinity At F2 Virtual and Erect Highly Diminished
Beyond infinity and 0 Between F1 and Optical centre Virtual and Erect Diminished
Here if the object is very far away, the images formed by lenses will be all the more diminished.
Image Formation by Convex Lens
In case of a convex lens, if we bring the object close to the lens, the size of the image keeps on increasing. As you bring the object more close to the lens, we get the image all the more enlarged. So here we can say that the images formed can be of a variety of types. We can have diminished inverted image, small sizes inverted image, enlarged inverted image, enlarged erect image. So in a concave lens, there is a possibility of getting a real as well as an inverted image.
Object location Image location Image nature Image size
Infinity At F2 Real and Inverted Diminished
Beyond 2F1 Between 2F2 and F2 Real and Inverted Diminished
Between 2F1 and F1 Beyond 2F2 Real and Inverted Enlarged
At F1 At infinity Real and Inverted Enlarged
At 2 F1 At 2F2 Real and Inverted Same size
Between F1 and 0 On the same side as object Virtual and Erect Enlarged
Images Formed in Different Lenses
Images Formed By Lenses.