a.) For a given angle of incident, one condition for total reflection is that th
ID: 2017821 • Letter: A
Question
a.) For a given angle of incident, one condition for total reflection is that the index of refraction be small enough in the substance where the light beam is refracted.
True or False?
b.) Which of the following is true?
1. A concave mirror never forms an enlarged real image of an object.
2. The virtual image formed by a concave mirror is always smaller than the object.
3. A concave mirror always forms a virtual image.
4. A convex mirror never forms a real image of a real object.
Explanation / Answer
a . true For total internal reflection , Incident angle > Critical angle Medium where light coming form must have higher index of refraction compared to second medium ( ni > nt) For any angle of incidence less than the critical angle, part of the incident light will be transmitted and part will be reflected. b . the answer is 4. A convex mirror never forms a real image of a real object.
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