Answer
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Hint: In this question use the concept that microscope is used to enlarge objects in order to have a better and clear visuals so that observation can be made accurately, however a simple microscope has a comparatively smaller focal length convex lens. This will help approaching the problem.
Complete step-by-step answer:
Microscope-
Microscope is a thing or instrument by which it makes small and unclear objects into big and clear objects.
I.e. it produces big and clear images of small and unclear images.
So it is termed as a microscope.
Simple microscope-
A simple microscope is also known as the magnifying lens, it consists of a double convex lens with a short focal length.
How small the focal length and how big the image formed.
So in a simple microscope we use very small focal length convex lenses.
It works on the principle that whenever we place an object between the focus and the optical center of the convex lens a magnified image is produced.
The produced image is large in size, virtual and erect.
In this type of microscope, the human eye is kept very close to the lens.
The examples of these types of instrument includes:
$\left( i \right)$ Hand lens
$\left( {ii} \right)$ Reading lens etc.
Usage of simple microscope
$\left( i \right)$ It is used to see the very small insects which cannot be seen by the naked eye.
$\left( {ii} \right)$ To read the scales of the instruments.
$\left( {iii} \right)$ It is used to see the bacteria and the fungi.
$\left( {iv} \right)$ It is used to see very small letters of the book.
So this is the required answer.
Note – There is a small confusion regarding the telescope and the microscope. A telescope is used to observe very far away or distant objects and the main application of a telescope is to build a smaller scale representation of the actual image that is being observed. However in contrast a microscope magnifies the actual image.
Complete step-by-step answer:
Microscope-
Microscope is a thing or instrument by which it makes small and unclear objects into big and clear objects.
I.e. it produces big and clear images of small and unclear images.
So it is termed as a microscope.
Simple microscope-
A simple microscope is also known as the magnifying lens, it consists of a double convex lens with a short focal length.
How small the focal length and how big the image formed.
So in a simple microscope we use very small focal length convex lenses.
It works on the principle that whenever we place an object between the focus and the optical center of the convex lens a magnified image is produced.
The produced image is large in size, virtual and erect.
In this type of microscope, the human eye is kept very close to the lens.
The examples of these types of instrument includes:
$\left( i \right)$ Hand lens
$\left( {ii} \right)$ Reading lens etc.
Usage of simple microscope
$\left( i \right)$ It is used to see the very small insects which cannot be seen by the naked eye.
$\left( {ii} \right)$ To read the scales of the instruments.
$\left( {iii} \right)$ It is used to see the bacteria and the fungi.
$\left( {iv} \right)$ It is used to see very small letters of the book.
So this is the required answer.
Note – There is a small confusion regarding the telescope and the microscope. A telescope is used to observe very far away or distant objects and the main application of a telescope is to build a smaller scale representation of the actual image that is being observed. However in contrast a microscope magnifies the actual image.
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