A) Optical fibres \[\leftrightarrow \] total internal reflection of light
B) Nuclear reactor \[\leftrightarrow \] nuclear fusion
C) Electron microscope \[\leftrightarrow \] wave nature of electrons
D) Electric generator \[\leftrightarrow \] laws of electromagnetic induction
Correct Answer: B
Solution :
(i) Optical fibre work on the principle of total internal reflection. (ii) A nuclear reactor is a device in which nuclear fission can be carried out through a sustained and a controlled chain reaction. (iii) An electron microscope is a form of microscope that uses a beam of electrons instead of beam of light to form a large image of a very small object. It is based on wave nature of light. (iv) An electric generator is a device used to convert mechanical energy to electrical energy. It is based on the principle of electromagnetic induction. When a coil is rotated about an axis perpendicular to the direction of uniform magnetic field, an induced emf is produced across it.
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