|Consider the following statement regarding laser.|
|1. A laser consists of a gain medium, a mechanism to supply energy to it.|
|2. The gain medium is a material with properties that do not allow it to amplify light by stimulated emission.|
|3. Most practical laser contain additional elements that affect properties of the emitted light such as the polarisation, the wavelength and the shape of the beam.|
|4. Laser has not the properties, namely, high monochromaticity, coherence and directionality.|
|Which of the statements given above are correct?|
A) 1 and 4
B) 2 and 3
C) 1, 2 and 3
D) 1 and 3
Correct Answer: D
Solution :[d] Statement 1 is correct, a laser consists of a gain medium supply energy to it. Statement 2 is incorrect, the gain medium is a material with properties that allow it to amplify light by stimulated emission. Statement 3 is correct with the aspect of laser. Statement 4 is incorrect, laser has the properties like, high monochromaticity, coherence and directionality.
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