E. Answer the following in detail.
1. Describe an experiment to show that the angle of incidence is equal to the angle of reflection,
2. Prove geometrically that the image formed by a plane mirror is at the same distance behind the
mirror as the objects in front of the mirror.
3. State the characteristics of an image formed by a plane mirror.
4. What are secondary colours? Why are they called so?
5. How are we able to see different colours?
6. An object appears blue in white light. Of what colour will it appear in red light?
7. What do you understand by colour subtraction?
Answers
Answer:
Reflection involves a change in direction of the light ray. The angle of incidence is the angle between this normal line and the incident ray; the angle of reflection is the angle between this normal line and the reflected ray. According to the law of reflection, the angle of incidence equals the angle of reflection.
As focal length of plane mirror tends to infinity. hence,the image formed by a plane mirror is at the same distance behind the mirror as the objects in front of the mirror.
In conclusion, plane mirrors produce images with a number of distinguishable characteristics. Images formed by plane mirrors are virtual, upright, left-right reversed, the same distance from the mirror as the object's distance, and the same size as the object.
Scientific definitions for secondary color. A color produced by mixing two additive primary colors in equal proportions. The secondary colors are cyan (a mixture of blue and green), magenta (a mixture of blue and red), and yellow (a mixture of green and red).
The human eye and brain together translate light into color. Light receptors within the eye transmit messages to the brain, which produces the familiar sensations of color. ... Rather, the surface of an object reflects some colors and absorbs all the others. We perceive only the reflected colors.
An object appears blue because it reflects back the blue color of white light and absorb rest of the colors. If we illuminate same object with red light then it will absorb red light and appears black in color.
The process of color subtraction is a useful means of predicting the ultimate color appearance of an object if the color of the incident light and the pigments are known. By using the complementary color scheme, the colors of light that will be absorbed by a given material can be determined.
l hope you understand..