science
Grade-7
Easy
Question
During refraction through a glass slab, the incident ray is not parallel to ____.
- Normal line
- Refracted ray
- Emergent ray
- None of the above
Hint:
The ray that enters the glass slab is called incident ray.
The correct answer is: Refracted ray
The correct option is b)refracted ray.
In a glass slab the angle of incidence is always equal to angle of emergence. These two rays are also parallel to each other.
The light ray is refracted twice by the glass slab and during this refraction it travels from one medium to another i.e from air to glass and again back to air.
During this process there is a lateral shift of the incidence ray which makes it parallel to the emergent ray.
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