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Class 12 Physics - Chapter 10: Wave Optics MCQ Questions

10 Questions 20 Minutes
Answered: 0 / 10Unanswered: 10

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Question 1

An interference pattern is observed by Young’s double-slit experiment. If now the separation between coherent sources is halved and the distance of screen from coherent sources is doubled, then fringe width

Question 2

In a Young’s double-slit experiment, the slits are separated by 0.28 mm and the screen is placed 1.4 m away. The distance between the central bright fringe and the fourth bright fringe is measured to be 1.2 cm. Determine the wavelength of light used in the experiment.

Question 3

The angular width of the central maximum in a single-slit diffraction pattern is 60°. The width of the slit is 1 mm. The slit is illuminated by monochromatic plane waves. If another slit of same width is made near it, Young’s fringes can be observed on a screen placed at a distance 50 cm from the slits. If the observed fringe width is 1 cm, what is slit separation distance? (i.e. distance between the centres of each slit)

Question 4

In a Young’s doubles-slit experiment, the source is white light. One of the holes is covered by a red filter and another by a blue filter. In this case

Question 5

The Young’s double-slit experiment is performed with blue and green light of wavelengths 436 nm and 546 nm, respectively. If x is the distance of 4th maxima from the central one, then

Question 6

In a Young’s double-slit experiment, slits are separated by 0.5 mm, and the screen is placed 150 cm away. A beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain interference fringes on the screen. The least distance from the common central maximum to the point where the bright fringes due to both the wavelengths coincide is:

Question 7

MCQ Questions for Class 12 Physics Chapter 10 Wave Optics with Answers 2

Question 8

In Young’s double-slit experiment the separation d between the slits is 2 mm, the wavelength X of the light used is 5896 A and distance D between the screen and slits is 100 cm. It is found that the angular width of the fringes is 0.20°. To increase the fringe angular width to 0.21° (with same λ and D) the separation between the slits needs to be changed to:

Question 9

MCQ Questions for Class 12 Physics Chapter 10 Wave Optics with Answers 1

Question 10

A linear aperture whose width is 0.02 cm is placed immediately in front of a lens of focal length 60 cm. The aperture is illuminated normally by a parallel beam of wavelength 5 × 10-5cm. The distance of the first dark band of the diffraction pattern from the centre of the screen is:

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