Physics Ray Optics Refraction in General, Refraction at Plane Surface and T.I.R. MCQ (Single Correct)

A ray of light traveling in water is incident on its surface open to air. The angle of incidence is θ , which is less than the critical angle. Then there will be :

A
only a reflected ray and no refracted ray
B
only a refracted ray and no reflected ray
C
a reflected ray and a refracted ray and the angle between them would be less than 180º – 2 θ
D
a reflected ray and a refracted ray and the angle between them would be greater than 180º – 2 θ .

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Text Solution

Verified by Experts
The correct answer is:
C

There will be partial reflection and refraction as shown in figure.

Angle between the reflected ray and the refracted ray = 180 – ( θ + φ ) which is less than
180 – 2 θ (because φ > θ )

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