Irregular reflections are caused by the irregularities in the reflecting surface.
Important Questions on Light
An observer moves towards a stationary plane mirror at a speed of 4 m/s the speed with which his image move towards him?
What is the difference between regular reflection and diffused reflection of light? Name one object which can produce regular reflection of light and another which produces diffuse reflection of light.
| column A | column B. |
| 1. A device used for seeing hexagonal image of an object | (a) Regular reflection |
| 2. A mirror used in solar cookers. | (b) Kaleidoscope |
| 3. A kind of reflection in which reflected rays travel parallel to one another. | (c) Plane mirror |
| 4. The kind of reflection taking place from the walls of a room. | (d) Dispersion |
| 5. The phenomenon of splitting of white light | (e) Diffused reflection |
| 6. A part of the eye which focusses rays on the retina. | (f) Yellow spot |
| 7. A highly sensitive part on the retina of human eye | (g) Crystalline lens |
| 8. A jelly like fluid found in the posterior part of the eye. | (h) Braille |
| 9. A defect in the eye when a person can see nearer objects, but not far-off objects. | (i) Vitreous humour |
| 10.Myopia A special script designed for visually challenged people for reading. | (j)Myopia |
What type of reflection of light takes place from a rough surface?
Mention against each of the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in case of piece of paper.
What type of reflection of light takes place from a cinema screen?
Which of the following will produce diffuse reflection of light?
(i) Plane mirror
(ii) Piece of paper
(iii) Still water in lake
(iv) Leather bag
