Wave Optics Quiz 4
Dear Readers,
JEE Advanced Physics Syllabus can be referred by the IIT aspirants to get
a detailed list of all topics that are important in cracking the entrance
examination. JEE Advanced syllabus for Physics has been designed in such a
way that it offers very practical and application-based learning to
further make it easier for students to understand every concept or topic
by correlating it with day-to-day experiences. In comparison to the other
two subjects, the syllabus of JEE Advanced for physics is developed in
such a way so as to test the deep understanding and application of
concepts.
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Q1. A thin film of refractive index 1.5 and thickness 4x10-5 cm is illuminated by light normal to the surface. What wavelength within the visible spectrum will be intensified in the reflected beam?
Solution
Q2.Light of wavelength λ=5890 Å falls on a double-slit arrangement having separation d=0.2 mm. A thin lens of focal length f=1 m is placed near the slits. The linear separation of fringes on a screen placed in the focal plane of the lens is
Solution
Q3. In hydrogen spectrum the wavelength of Hα line is 656 nm whereas in the spectrum of a distant galaxy, Hα line wavelength is 706 nm. Estimated speed of the galaxy with respect to earth is
Solution
Q4. Two coherent light sources, each of wavelength λ, are separated by a distance 3λ. The maximum number of minima formed on line AB, which runs from -∞ to +∞, is
Solution
Q5.Two beams of light having intensities I and 4I interfere to produce a fringe pattern on a screen. The phase between the beams is π/2 at point A and π at point B. Then, the difference between the resultant intensities at A and B is
Solution
Q6. Figure shows two coherent sources S1 and S2 vibrating in same phase. AB is an irregular wire lying at a far distance from the sources S1 and S2. Let λ/d=10-3 ∠BOA=0.12°. How many bright spots will be seen on the wire, including points A and B?
Solution
Q7.In a YDSE, light of wavelength λ=5000 Ã… is used, which emerges in phase from two slits a distance d=3×10-7m apart. A transparent sheet of thickness t= 1.5×10-7m, refractive index n=1.17, is placed over one of the slits. Where does the central maxima of the interference now appear from the center of the screen? (Find the value of y?)
Solution
Q8.In Young’s double-slit experiment, the slits are 0.5 mm apart and the interference is observed on a screen at a distance of 100 cm from the slits. It is found that the ninth bright fringe is at a distance of 7.5 mm found that the ninth bright fringe is at a distance of 7.5 mm from the second dark fringe from the center of the fringe pattern. The wavelength of the light used is
Solution
Q9.In Young’s double-slit experiment, the separation between two coherent sources S1 and S2 is d and the distance between the source and screen is D. In the interference pattern, it is found that exactly in front of one slit, there occurs a minimum. Then the possible wavelengths used in the experiment are
Solution
Q10. Sources 1 and 2 emit lights of different wavelengths whereas 3 and 4 emit lights of different intensities. The coherence
Solution
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