Propagation of Light
Propagation of Light
Light travels along straight lines in a medium or in vacuum. The path of light changes only when there is an object in its path or where the medium changes. We call this rectilinear (straight-line) propagation of light. Light that starts from a point A and passes through another point B in the same medium actually passes through all the points on the straight-line AB. Such a straight-line path of light is called a ray of light.
Light rays start from each point of a source and travel along straight lines till they fall on an object or a surface separating two media (mediums). A bundle of light rays is called a beam of light.
Three main processes generally occur when light passes between boundaries from one medium to another.
Which of the following are correct : (a) Light travels along straight lines in a medium or in vacuum. (b) Reflection happens when light get absorbed by the medium like glass and does not get reflected, absorbed and scattered. | |||
| Right Option : A | |||
| View Explanation | |||
Statement (i) : Light travels in a straight line. Statement (ii) : Light requires a medium to travel. | |||
| Right Option : A | |||
| View Explanation | |||
"Speed of light is the same, no matter how it is measured". was first contemplated by | |||
| Right Option : C | |||
| View Explanation | |||
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