Optical Fibre technology works on which of these principles of Physics?

Optical Fibre technology works on which of these principles of Physics? Correct Answer Total internal reflection of Light

The optical fibre is a device which works on the principle of total internal reflection by which light signals can be transmitted from one place to another with a negligible loss of energy.
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Q.(1-4): Answer the questions on the basis of the information given below. * F,G and H are insurance companies , Q,R,S and T are private detectives .Each detective works for at least one of the insurance companies. * Q always works for F and at least one of the other companies. Some of the time G employs only one of these detectives,' the rest of the time it employs exactly two of them. *F and H each employ exactly two of these detectives all the time. If R works for H only, and if S works for G and H only, T works for--
. ‘পদার্থবিদ্যার শিক্ষক হিসেবে তােমার যােগ্যতা সম্পর্কে কেউ সন্দেহ। পােষণ করে না' এই বাক্যের ইংরেজি অনুবাদ হিসেবে নিচের কোন বাক্য/বাক্যসমূহ গ্রহণযােগ্য? (1) No one doubts your competence as a teacher of physics. (2) No one has and doubt about as a teacher of physics No one has and doubt about your competence as a teacher of physics. (3) No one doubts that your are a competent teacher
If Arif works alone he will take 20 more hours to complete a task than if he works with Babu to complete the task. If Babu work alone, he will take 5 more hours to complete the task than if he works with Arif to complete the task. What is the ratio of the time taken by Arif to than taken by Babu if each of them works alone to complete the task?
Optical fibre works on which of the following principle of light?
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A school has a total enrollment of 9- students. There are 30 students taking Physics, 25 taking English, and 13 taking both. What percentage of the students are taking either Physics or English?
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A school has a total of 90 students. There are 30 students taking Physics, 25 taking English, and 13 taking both. Approximately what percentage of the students is taking either Physics or English?