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22. What are three types of lasers?
(a) Gas, metal vapor, rock
(b) Pointer, diode, CD
(c) Diode, inverted, pointer
(d) Gas, solid state, diode
| Subject Name : General Knowledge |
| Exam Name : UPSC, SSC, KVS, NVS, IBPS, RBI, SBI, RRB |
| Posts Name : Post Graduate Teacher, College Lecturer, Officer, Office Assistant, Clerk |
| General Knowledge Books |
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