Which of the following are the characteristics of Laser beams? (1) They are monochromatic (2) They are coherent (3) They have high degree of parallelism (4) They are not monochromatic

Which of the following sources of light is monochromatic source ?

Which of the following sources gives best monochromatic light?

Which of the following sources gives best monochromatic light?

Out of the following of which colour a monochromatic beam cannot be obtained ?

Consider the following statement regarding a beam of LASER. (I) It is highly monochromatic. (II) It is an electromagnetic radiation from a source. (III) It travels with the speed of light. Which of the statements given above are correct?

Consider the following statement regarding a beam of LASER. (I) It is highly monochromatic. (II) It is an electromagnetic radiation from a source. (III) It travels with the speed of light. Which of the statements given above are correct?

State whether the following statements are True (T) or False (F) A polychromatic beam after dispersion is a beam of monochromatic lights which projected on the screen is called the spectrum.