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Standard IX
Science
Question

Total internal reflection takes place:
  1. When a ray moves from denser medium to rarer medium and incident angle is greater than critical angle
  2. When a ray moves from rarer medium to denser medium and incident angle is less than critical angle
  3. When a ray moves from rarer medium to denser medium and incident angle is equal to critical angle
  4. None of the above

A
When a ray moves from denser medium to rarer medium and incident angle is greater than critical angle
B
When a ray moves from rarer medium to denser medium and incident angle is less than critical angle
C
When a ray moves from rarer medium to denser medium and incident angle is equal to critical angle
D
None of the above
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Solution
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Total internal reflection is defined as the complete reflection of a light ray at the boundary of two media when the ray is in the medium with greater refractive index.Total internal reflection takes place in two following conditions: When the light is in the more dense medium and approaching the less dense medium.

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Q1

Total internal reflection of a ray of light is possible when the (ic = critical angle, i = angle of incidence)


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Q2
Which of the following are the essential conditions for Total Internal Reflection to take place?
A. Ray of light should travel from rarer medium to denser medium.
B. Ray of light should travel from denser medium to rarer medium.
C. Angle of incidence should be greater than the critical angle.
D. Critical angle must be greater than the angle of incidence.
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Q3
Which of the following conditions are necessary for total internal reflection to take place at the boundary of two optical media ?
1. Light is passing from optically denser medium to optically rarer medium.
2. Light is passing from optically rarer medium to optically denser medium.
3.Angle of incidence is greater than the critical angle.
4.Angle of incidence is less than the critical angle.
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When light travels from a denser medium to a rarer medium at an angle less than the critical angle, the ray is
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Q5
A light ray is incident from a denser medium on the boundary separating it from a rarer medium at an angle of incidence equal to the critical angle. What is the angle of refraction for the ray?
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