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) The path of light changes only when there is an object in its path or where the medium changes. (b) A bundle of light rays is called a beam of light. (c) A medium in which light cannot travel is called transparent. | |||
Right Option : A | |||
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A medium in which light cannot travel is called _________________________ . | |||
Right Option : B | |||
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Which of the following are correct ? (a) Light travels along straight lines in a medium or in vacuum. (b) The refraction is the change in the direction of wave passing from one medium to other. (c) A medium in which light cannot travel is called opaque. Wood, metals, bricks, etc . | |||
Right Option : D | |||
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