Free PDF Download of CBSE Class 12 Physics Chapter 10 Wave Optics Assertion Reason Questions for Class 12 Physics. Class 12 Physics Assertion Reason Questions with Answers were Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Physics Wave Optics to know their preparation level.
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Wave Optics Class 12 Assertion Reason Questions
The following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false and R is also false.
Assertion (A) : The maximum intensity in interference pattern is four times the intensity due to each slit.
Reason (R): Intensity is directly proportional to square of amplitude.
(b) Both A and R are true but R is not the correct explanation of A.
Assertion (A) : Diffraction is common in sound but not common in light waves.
Reason (R): Wavelength of light is more than the wavelength of sound
(c) A is true but R is false.
Assertion (A) : Interference obeys the law of conservation of energy.
Reason (R) : The energy is redistributed in case of interference
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A) : We cannot get diffraction pattern from a wide slit illuminated by monochromatic light.
Reason (R) : In diffraction pattern, all the bright bands are not of the same intensity.
(b) Both A and R are true but R is not the correct explanation of A.
Assertion (A) : When a light wave travels from a rarer to a denser medium, it loses speed. The reduction in speed imply a reduction in energy carried by the light wave.
Reason (R) : The energy of a wave is proportional to velocity of wave.
(d) A is false and R is also false.
Assertion (A) : The film which appears bright in reflected system will appear dark in the transmitted light and vice-versa.
Reason (R) : The conditions for film to appear bright or dark in reflected light are just reverse to those in the transmitted light.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A) : In Young’s double slit experiment, the fringes become indistinct if one of the slits is covered with cellophane paper.
Reason (R) : The cellophane paper decrease the wavelength of light.
(c) A is true but R is false.
Assertion (A) : One of the condition for interference is that the two source should be very narrow.
Reason (R) : One broad source is equal to large number of narrow sources.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A) : When tiny circular obstacle is placed in the path of light from some distance, a bright spot is seen at the centre of the shadow of the obstacle.
Reason (R) : Destructive interference occurs at the centre of the shadow.
(c) A is true but R is false.
Assertion (A): The phenomenon of interference occurs when two or more waves overlap and combine.
Reason (R): Interference is a result of the superposition of waves, where the amplitudes of the overlapping waves add up.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Diffraction is a wave phenomenon that occurs when waves bend around obstacles or pass through small openings.
Reason (R): Diffraction is a result of the spreading of waves as they encounter obstructions or openings of comparable size to their wavelength.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Young’s double-slit experiment demonstrates the wave nature of light.
Reason (R): In Young’s experiment, light passes through two closely spaced slits, creating an interference pattern on the screen, which confirms the wave nature of light.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The fringe width in Young’s double-slit experiment decreases with an increase in the distance between the slits and the screen.
Reason (R): The fringe width is determined by the wavelength of light and the distance between the slits and the screen.
Answer: (c) A is true but R is false.
Assertion (A): The phenomenon of polarized light occurs when light waves vibrate in a single plane.
Reason (R): Polarization of light happens when unpolarized light passes through a polarizer, which allows only waves vibrating in a particular plane to pass through.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The Huygens-Fresnel principle explains the phenomenon of reflection and refraction of light.
Reason (R): According to the Huygens-Fresnel principle, every point on a wavefront acts as a source of secondary wavelets, which combine to form the new wavefront during reflection and refraction.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The phenomenon of total internal reflection occurs when light passes from a denser medium to a rarer medium at an angle greater than the critical angle.
Reason (R): Total internal reflection occurs when all the incident light is reflected back into the denser medium, with none of it refracted into the rarer medium.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The resolving power of an optical instrument is determined by the wavelength of light used to view the object.
Reason (R): The resolving power is directly proportional to the wavelength of light used, and shorter wavelengths provide better resolution.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The critical angle is the maximum angle of incidence at which total internal reflection occurs.
Reason (R): Total internal reflection occurs when light travels from a rarer medium to a denser medium at an angle greater than the critical angle.
Answer: (c) A is true but R is false.
Assertion (A): The fringes observed in Young’s double-slit experiment are a result of constructive and destructive interference.
Reason (R): The path difference between the waves determines the constructive or destructive interference at different points on the screen.
Answer: (a) Both A and R are true and R is the correct explanation of A.
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