1. What is the difference between the surfaces of a sheet of sandpaper and a mirror?
2. Calculate the number of images formed by plane mirror kept an angle of (i) 30° (ii)
60° to each other?
3. “The law of reflection only holds true for regular reflection'. Is this statement true or
false? Explain you answer
4. A Wall reflects light and a mirror also reflects light. What difference is there in the
way they reflect light?
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Answers
Answer:
1,Paper has a relatively rough surface compared with a mirror. ... By contrast, a mirror reflects light in a orderly way. That's because of the mirror's smooth surface (usually a metal behind glass).
2,If the image of an object is viewed in two plane mirrors that are inclined to each other more than one image is formed. The number of images depends on the angle between the two mirrors.
The number of images formed in two plane mirrors inclined at an angle A to each other is given by the below formula.Number of images n= 360/A - 1
The number of images formed n=(360/A)-1, if (360/A) is even integer.If (360/A) is odd integer, the number of images formed n=(360/A)-1 when the object is kept symmetrically, and n=(360/A) when object is kept asymmetrically.
If (360/A) is a fraction, the number of images formed is equal to its integral part.
As the angle gets smaller (down to 0 degrees when the mirrors are facing each other and parallel) the smaller the angle the greater the number of images.
Here, the angle A between the mirrors is 40 degrees.
Case (a): The object is symmetrically placed.
The number of images formed = (360/40)-1, we get 8 images.
Case (b): The object is asymmetrically placed.
The number of images formed = (360/40), we get 9 images.
Hence, the number of images formed are 8 and 9 respectively.
3,Laws of reflection holds true. Due to irregularities on surface, reflected rays scatter in different directions. Mention against each of the following whether regular or diffused reflection will take place when a beam of light strikes. ... Regular reflection takes place.
4,A wall has a rough surface, so the reflection by a wall is a diffuse reflection. A parallel beam of light incident on it is reflected in different directions. A mirror surface is smooth, so the reflection by a mirror is a regular reflection
Explanation:
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