science
Grade-7
Easy
Question
A ray of light is incident on an air-water interface at an angle of 48 degrees. The angle of refraction will be ___ degrees.
- > 48
- = 48
- < 48
- Any of the above
Hint:
The rays shift towards the normal while travelling from rarer medium to denser medium.
The correct answer is: < 48
The light travels from air to water which means the ray is travelling from rarer to denser medium. When the ray moves from rarer to denser medium it moves closer to the normal due to which the angle of refraction also decreases. Therefore, the angle of refraction will be smaller than the angle of incidence i.e 48 degrees.
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