question_answer

Shankar complained of a severe stomach pain and started crying. His elder brother brought him to a gastroenterologist. The doctor advised for an endoscopy and asked him to come the next day on an empty stomach. The test was done and Shankar felt okay after taking medicine.

(i) What values of Shankar's elder brother impress you?

(ii) What is the working principle of the glass fibre in the endoscope?

(iii) Write down conditions for total internal reflection.

Answer:

(i) Taking up responsibility, affectionate timely action, concern for his brother.

(ii) Total internal reflection (TIR)

Condition

(a) Light must travel from an optical denser medium to an optical rarer medium.

(b) The angle of incidence (i) in the denser medium must be greater than the critical angle \[({{\theta }_{C}})\] for the two medium, \[i>{{\theta }_{c}}.\]