science
Grade-7
Easy
Question
During normal incidence on a glass slab, the angle of incidence = ____.
- The angle of refraction
- The angle of emergence
- Both 1 and 2
- None of the above
Hint:
In a glass slab the ray travels from rarer medium to denser medium and then again into rarer medium. When the ray moves from rarer medium to denser medium the ray moves closer to the normal and vice versa.
The correct answer is: Both 1 and 2
The correct option is c) Both 1 and 2.
The angle between the refracted ray and the normal at the point of incidence is called the angle of refraction.
The exit angle is the angle at which light exits a medium (such as a parallel-sided glass plate). The first medium is air, and the intermediate medium is water or a parallel-sided glass plate. A ray of light travels diagonally downward through the air and into the glass.
The incident angle is always equal to the exit angle on the glass plate (i=e).
This is true only for a glass slab.
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