Physics
At angle of incidence equal to the critical angle, the angle of refraction is:
- 0°
- 30°
- 90°
- 180°
Refraction Plane Surfaces
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Answer
90°
Reason — When light travels from a denser medium to a rarer medium and the angle of incidence is equal to the critical angle, the angle of refraction becomes 90° as shown in the below fig:
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Related Questions
A coin is placed at the bottom of a beaker containing water (refractive index = 4/3) at a depth of 16 cm. By what height the coin appears to be raised when seen from vertically above?
A postage stamp kept below a rectangular glass slab of refractive index 1.5 when viewed from vertically above it, appears to be raised by 7.0 mm. Calculate the thickness of the glass slab.
The correct relation between critical angle and refractive index of a medium is:
- cos C =
- tan C =
- sin C =
- sin C =
The critical angle for the glass-air interface is:
- 24°
- 48°
- 42°
- 45°