What are three types of Lasers ?

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What are three types of Lasers ?

AGas, metal vapor , rock

BPointer , diode, CD

CDiode, inverted, pointer

DGas, solid state, diode

Answer:

D. Gas, solid state, diode

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ഇന്ത്യൻ ശാസ്ത്രജ്ഞർ വികസിപ്പിച്ച സൂപ്പർ കമ്പ്യൂട്ടർ തിരഞ്ഞെടുക്കുക.