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Q: When light is incident along the normal and passes from air to water, then the direction of light will .................
  • A. not be changed
  • B. change at the boundary
  • C. change before entering water
  • D. change after entering water
Correct Answer: Option A - When a light is incident along to the normal and from air to water, then the direction of light will not be change because when a light ray incident perpendicular on the plane which separates two medium then there is no refraction of light ray takes place.
A. When a light is incident along to the normal and from air to water, then the direction of light will not be change because when a light ray incident perpendicular on the plane which separates two medium then there is no refraction of light ray takes place.

Explanations:

When a light is incident along to the normal and from air to water, then the direction of light will not be change because when a light ray incident perpendicular on the plane which separates two medium then there is no refraction of light ray takes place.