Answer the following in not more than 20 words.
1. What happens to the rays of light in case of diffuse reflection?
2. An object is placed 10 cm in front of a plane mirror. Where is the image formed? How far is it from the mirror?
3. An object is placed between two mirrors that are at right angles to each other. How many images are formed?
4. What is white light? Give an example.
5. Define dispersion.
6. Which parts of the eye make up its converging lens system?
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7. A person has myopia. What problem does he face?
8. What is the first stage of nutritional blindness?
Answers
Explanation:
chemical reaction is a process in which one or more substances, also called reactants, are converted to one or more different substances, known as products. ... A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
Answer:
1. In case of diffuse reflection the rays of light are scattered at many angles from the surface to which it strikes.
2.If an object is placed at a distance of 10 cm in front of a plane mirror, it would be 20 cm away from its image since the image formed is at the same distance from the mirror as the object is in front of it.
3. Interestingly, a single mirror produces a single image; another single mirror produces a second image; but when you put the two single mirrors together at right angles, there are three images.
4. For example, the sun and other stars are sources of white light. The sun is the most obvious source of white light in our solar system. As for artificial sources, fluorescent light bulbs and white LEDs produce white light. Other light bulbs, like the incandescent lamp, do not produce white light.
5. Dispersion is a statistical term that describes the size of the distribution of values expected for a particular variable and can be measured by several different statistics, such as range, variance, and standard deviation.
6.cornea ;the lens and the fluid make pe the converging lens system of eye.
7. Myopia is also known as nearsightedness. People with myopia can typically see well enough to read a book or computer screen but struggle to see the distance objects. People with Undiagnosed myopia have headache and eyestrain .
8. Nyctalopia (night blindness) is one of the first signs of VAD. Xerophthalmia, keratomalacia, and complete blindness can also occur since vitamin A has a major role in phototransduction. The three forms of vitamin A include retinols, beta-carotenes, and provitamin A carotenoids.