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Question
Describe an experiment to show that a light ray bends when it passes from one transparent medium into another transparent medium.
Describe an experiment to show that a light ray bends when it passes from one transparent medium into another transparent medium.
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Solution
EXPERIMENT: Spread and fix a sheet of white paper on the drawing board.
At the centre of the paper, place a glass slab XYX ‘ Y’ and draw its boundary.
A ray of light AB travelling from the air (rarer medium) to glass slab (denser medium). Part of path BC in denser medium bends towards the normal.
∠r ∠i. This shows that when light travels from RARER to DENSER medium bends towards the normal. Ray BC travels from DENSER medium to RARER medium in the air (RAY CD) bend away from normal. ∠e >∠r.
This shows that when a ray of light travels from DENSER to RARER medium bends AWAY from normal.
EXPERIMENT: Spread and fix a sheet of white paper on the drawing board.
At the centre of the paper, place a glass slab XYX ‘ Y’ and draw its boundary.
A ray of light AB travelling from the air (rarer medium) to glass slab (denser medium). Part of path BC in denser medium bends towards the normal.
∠r ∠i. This shows that when light travels from RARER to DENSER medium bends towards the normal. Ray BC travels from DENSER medium to RARER medium in the air (RAY CD) bend away from normal. ∠e >∠r.
This shows that when a ray of light travels from DENSER to RARER medium bends AWAY from normal.
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