A Parallel Beam of Monochromatic Light Is Incident on a Slit

question 59

Multiple Choice

A parallel beam of monochromatic light is incident on a slit of width 2 cm. The light passing through the slit falls on a screen 2 m away. As the slit width is decreased:

• A) the width of the pattern on the screen continuously decreases
• B) the width of the pattern on the screen at first decreases but then increases
• C) the width of the pattern on the screen increases and then decreases
• D) the width of the pattern on the screen remains the same
• E) the pattern on the screen changes color going from red to blue

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