## Diffraction of light- MCQ-Basic

Physics is an important subject in preparation for various Competitive exams. To keep a track of your preparation we have designed a small quiz of 10 Basic Level Questions on Diffraction of light.You have 10 minutes to solve the quiz, click the start timer button in order to start the timer and then click on submit button at the end to submit the quiz and view your scores and correct answers.

Q1. When light is incident on a diffraction grating the zero order principal maximum will be

•  One of the component colours
•  Absent
•  Spectrum of the colours
•  White

White

Q2. A beam of light of wavelength 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between the first dark fringes on either side of the central bright fringe is

•  1.2 mm
•  1.2 cm
•  2.4 cm
•  2.4 mm

2.4 mm

Q3. A diffraction pattern is obtained using a beam of red light. What happens if the red light is replaced by blue light

•  No change
•  diffraction bands become narrower and crowded together
•  Bands become broader and farther apart
•  Bands disappear

diffraction bands become narrower and crowded together

Q4. Angular width (Î²) of central maximum of a diffraction pattern on a single slit does not depend upon

•  Distance between slit and source
•  Wavelength of light used
•  Width of the slit
•  Frequency of light used

Distance between slit and source

Q5. What will be the angle of diffracting for the first minimum due to Fraunhoffer diffraction with sources of light of wave length 550 nm and slit of width 0.55 mm

Q6. The bending of beam of light around corners of obstacles is called

•  Reflection
•  Diffraction
•  Refraction
•  Interference

Diffraction

Q7. Diffraction effects are easier to notice in the case of sound waves than in the case of light waves because

•  Sound waves are longitudinal
•  Sound is perceived by the ear
•  Sound waves are mechanical waves
•  Sound waves are of longer wavelength

Sound waves are of longer wavelength

Q8. A parallel monochromatic beam of light is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of incident beam. At the first maximum of the diffraction pattern the phase difference between the rays coming from the edges of the slit is

•  0
•  Ï€/2
•  Ï€
•  2Ï€

Ï€

Q9. Diffraction and interference of light suggest

•  Nature of light is electro-magnetic
•  Wave nature
•  Nature is quantum
•  Nature of light is transverse

Wave nature

Q10. The condition for observing Fraunhofer diffraction from a single slit is that the light wavefront incident on the slit should be

•  Spherical
•  Cylindrical
•  Plane
•  Elliptical

Plane

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