Chapter 1: Electric Charges and Fields
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Chapter 2: Electrostatic Potential and Capacitance
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Chapter 3: Current Electricity
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Chapter 4: Moving Charges and Magnetism
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Chapter 5: Magnetism and Matter
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Chapter 6: Electromagnetic Induction
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Chapter 7: Alternating Current
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Chapter 8: Electromagnetic Waves
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Chapter 9: Ray Optics and Optical Instruments
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Chapter 11: Dual Nature of Radiation and Matter
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Chapter 12: Atoms
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Chapter 13: Nuclei
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Chapter 14: Semiconductor Electronics Materials
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Chapter 15: Communication Systems
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1.
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Select the correct answer from the codes (a), (b), (c) and (d) as given below.
Assertion (A): The phase difference between any two points on a wavefront is zero.
Reason (R): All points on a wavefront are at the same distance from the source and thus oscillate in the same phase.
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Assertion (A) is false and Reason (R) is also false.
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2.
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According to Huygens principle, the amplitude of secondary wavelets is
(a) equal in both the forward and the backward directions.
(b) maximum in the forward direction and zero in the backward direction.
(c) large in the forward direction and small in the backward direction.
(d) small in the forward direction and large in the backward direction.
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3.
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A plane wavefront is incident on a concave mirror of radius of curvature R. The radius of the refracted wavefront will be:
(a) 2R (b) R (c) (d)
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4.
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When a wave undergoes reflection at an interface from rarer to denser medium, adhoc change in its phase is :
(a) (b) 0 (c) 𝜋 (d)
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5.
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Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
Assertion (A): In Young’s double slit experiment all fringes are of equal width.
Reason (R): The fringe width depends upon wavelength of light (𝜆) used, distance of screen from plane of slits (D) and slits separation (d).
(a) Both assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
(b) Both assertion (A) and Reason (R) are true and Reason (R) is NOT the correct explanation of Assertion (A).
(c) Assertion (A) is true and Reason (R) is false.
(d) Assertion (A) is false and Reason (R) is also false.
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1.
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State Huygens principle. How did Huygens explain the absence of the backwave?
(CBSE 2023, 2M)
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2.
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Define the term wavefront. Using Huygen’s wave theory, verify the law of reflection.
(CBSE 2019, 3M)
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3.
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Using Huygens principle, draw a ray diagram showing the propagation of a plane wave refracting at a plane surface separating two media. Also verify Snell’s law of refraction.
(CBSE 2023, 2M)
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4.
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Use Huygens principle to show reflection / refraction of a plane wave by (i) concave mirror, and (ii) a convex lens.
(CBSE 2023, 2M)
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5
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A plane wavefront is incident on a surface separating two media of refractive indices n1 and n2 (> n1). With the help of a suitable diagram, explain its propagation from the rarer to denser medium. Hence, verify Snell’s law.
(CBSE 2022, 3M)
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Chemistry
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Biology
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Mathematics
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Physical Education
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Chapter Name
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Sub Topics of Chapter 10: Wave Optics
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Wave Optics
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10.1 Introduction
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10.2 Huygens’ Principle
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10.3 Coherent Sources and Interference of Light
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10.4 Young’s Double-Slit Experiment
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10.5 Diffraction
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10.6 Polarization
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