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Q: For a ray of light undergoing refraction through a triangular glass prism, which of the following statement is/are always correct? (A) Angle of incidence is the angle between the incident ray and normal at the point of incidence. (B) Angle of incidence is equal to angle of emergence. (C) Angle of deviation is the angle between incident ray and emergent ray.
  • A. Only (A)
  • B. Both (A) and (C)
  • C. Both (B) and (C)
  • D. Only (B)
Correct Answer: Option B - On the first surface, the incident ray bends towards the normal i.e. towards the base and splits into different color bands. Upon striking the second surface each band is deviated away from the normal which is towards the base and hence the emergent ray is bent towards the base of the prism.
B. On the first surface, the incident ray bends towards the normal i.e. towards the base and splits into different color bands. Upon striking the second surface each band is deviated away from the normal which is towards the base and hence the emergent ray is bent towards the base of the prism.

Explanations:

On the first surface, the incident ray bends towards the normal i.e. towards the base and splits into different color bands. Upon striking the second surface each band is deviated away from the normal which is towards the base and hence the emergent ray is bent towards the base of the prism.