A portion of straight glass rod of diameter 4 cm and refractive index – InterviewSolution

1.	A portion of straight glass rod of diameter 4 cm and refractive index 1.5 is bent into an arc of circle of radius R and a parallel beam of light is incident on it as shown in figure. Radius of arc includes outer edge of glass rod. Smallest R in cm which permits all the light to pass around arc is (Write upto two digits after the decimal point.)
Answer» A portion of straight glass rod of diameter 4 cm and refractive index 1.5 is bent into an arc of circle of radius R and a parallel beam of light is incident on it as shown in figure. Radius of arc includes outer edge of glass rod. Smallest R in cm which permits all the light to pass around arc is (Write upto two digits after the decimal point.)

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