In an optical camera ,state what is meant by f-number, the nature of lens and two characteristics of the image formed by the lens .Draw daigram of optical camera
Dear student,
A number that represents the relative aperture of a lens, equal to the focal length divided by the effective diameter of the lens aperture is known as f-number.
Working of a Camera
The image is formed when a light is reflected back from the object.
Let us understand how the image is formed in a pinhole camera by taking a practical example.
Suppose you are inside your house and there is a tree in front of one of the windows of the house. Now take a cardboard to make a small hole in it and place it parallel to the window. Look from the hole you will observe that if you move to the right a bit, you will see the left of the tree. If you move up, you will see further down the tree. Your view of the tree is just opposite to the direction of your movement.
Now cover the window such that light only passes through the hole. The image of the tree on the wall will be upside down. The ray diagram below will make it clear.
Regards
A number that represents the relative aperture of a lens, equal to the focal length divided by the effective diameter of the lens aperture is known as f-number.
Working of a Camera
The image is formed when a light is reflected back from the object.
Let us understand how the image is formed in a pinhole camera by taking a practical example.
Suppose you are inside your house and there is a tree in front of one of the windows of the house. Now take a cardboard to make a small hole in it and place it parallel to the window. Look from the hole you will observe that if you move to the right a bit, you will see the left of the tree. If you move up, you will see further down the tree. Your view of the tree is just opposite to the direction of your movement.
Now cover the window such that light only passes through the hole. The image of the tree on the wall will be upside down. The ray diagram below will make it clear.
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This is how the image formation in camera takes place.
Regards