(1) State FOUR differences between the camera and human eye.
(2) Explain dispersion and monchromatic light.
(3) Describe the all the defects in human eye and state their correction methods.
(4) Explain how how a convex lens could be used as a magnifying glass.
Answers
Answer:
1. Eye is an organ of sight while a camera is equipment that is used to record images.
The first and the foremost difference between an eye and a camera is that an eye cannot record an image. The eyes use living cells to detect and interpret the light and convert these into electrical signals that are relayed to the brain and processed into an image. The camera on the other hand uses a diaphragm from where the image is recorded on film or like in modern cameras on tape or digitally.
A camera sees in 2 dimensions while the eye sees in 3 dimensions.
2. Monochromatic light means light with a single colour. Dispersion is separation of the different colours in white light while passing through a prism or any such material.
3. There are three common defects in vision. They are
-myopia
-hypermetropia
-presbyopia
These defects in vision can be corrected using suitable spherical lenses.
4. A magnifying glass uses a convex lens, which is a converging lens to produce an image. The image produced is upright, magnified and virtual as long as the object is at or within the focal length of the lens.
Hope this helps u...