science
Grade-7
Easy
Question
A ray of light is incident on an air-glass interface at an angle of 48 degrees and finally comes out from glass to air, after refraction through glass slab, the angle of emergence will be ___ degrees.
Hint:
Here the ray undergoes double refraction.
The correct answer is: 48
The ray undergoes double refraction. Here the angle of incidence is equal to the angle of emergence. When the ray travels from rarer medium to denser medium (air to glass) the ray shifts towards the normal and when it comes out from the glass again to air, (denser to rarer medium) the ray moves away from the normal.
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