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Q: A ray of light in glass is incident at an angle of 30º on the surface separating glass from air. The ray is refracted in the air at an angle of _____ and the refracted ray ____ in the plane of the incident ray.
  • A. more than 30º, does not lie
  • B. more than 30º, lies
  • C. less than 30º, does not lie
  • D. less than 30º, lies
Correct Answer: Option B - A ray of light in glass is incident at an angle of 30º on the surface separating glass from air, the ray is refracted in the air at an angle of more than 30º and the refracted ray lies in the plane of the incident ray because when a ray of light enters from a denser medium (glass) to a rarer medium (air) it bends away from the normal, be cause angle of refraction will be greater than the angle of incidence.
B. A ray of light in glass is incident at an angle of 30º on the surface separating glass from air, the ray is refracted in the air at an angle of more than 30º and the refracted ray lies in the plane of the incident ray because when a ray of light enters from a denser medium (glass) to a rarer medium (air) it bends away from the normal, be cause angle of refraction will be greater than the angle of incidence.

Explanations:

A ray of light in glass is incident at an angle of 30º on the surface separating glass from air, the ray is refracted in the air at an angle of more than 30º and the refracted ray lies in the plane of the incident ray because when a ray of light enters from a denser medium (glass) to a rarer medium (air) it bends away from the normal, be cause angle of refraction will be greater than the angle of incidence.