10. Wave Optics
рдЗрд╕ рдкреЗрдЬ рдкрд░ рдЖрдкрдХреЛ 10. Wave Optics рдХреЗ рд╕рднреА рдорд╣рддреНрд╡рдкреВрд░реНрдг рдмрд╣реБрд╡рд┐рдХрд▓реНрдкреАрдп рдкреНрд░рд╢реНрди (MCQ), рдкрд░реАрдХреНрд╖рд╛ рдЙрдкрдпреЛрдЧреА рдиреЛрдЯреНрд╕ рдФрд░ рдСрдирд▓рд╛рдЗрди рдХреНрд╡рд┐рдЬрд╝ рдорд┐рд▓реЗрдВрдЧреЗред рдЕрдкрдиреЗ рдЬреНрдЮрд╛рди рдХрд╛ рдкрд░реАрдХреНрд╖рдг рдХрд░рдиреЗ рдФрд░ рдмреЛрд░реНрдб/рдкреНрд░рддрд┐рдпреЛрдЧреА рдкрд░реАрдХреНрд╖рд╛ рдореЗрдВ рд╢рдд-рдкреНрд░рддрд┐рд╢рдд рдЕрдВрдХ рдкреНрд░рд╛рдкреНрдд рдХрд░рдиреЗ рдХреЗ рд▓рд┐рдП рдиреАрдЪреЗ рджрд┐рдП рдЧрдП рдореЙрдХ рдЯреЗрд╕реНрдЯ рдореЗрдВ рдЕрд╡рд╢реНрдп рднрд╛рдЧ рд▓реЗрдВред
ЁЯСЙ рдЕрдзреНрдпрд╛рдп рдХрд╛ рд╕рд╛рд░рд╛рдВрд╢ (Summary)
Dear students, in this chapter, we will deeply study 1 extremely fascinating, historical, and highly debated branch of physics that completely changes our understanding of light: 'Wave Optics'. In the previous chapter, we studied ray optics, where we simply assumed that light always travels in 1 perfectly straight line. But is light really just 1 stream of straight-moving particles? Exactly in 1678, a brilliant scientist named Christiaan Huygens boldly proposed 1 completely different and revolutionary theory. He mathematically proved that light actually travels exactly like waves, very similar to the ripples formed when you throw 1 small stone into 1 silent pond. This single phenomenal concept successfully explained deep secrets of light that simple ray optics completely failed to answer.
Instead of just cramming complex mathematical formulas in closed books, if we logically connect physics with our modern daily life, it feels extremely magical. Have you ever thought deeply about why exactly 1 extremely thin layer of oil floating on wet road water or 1 simple soap bubble beautifully displays 7 brilliant rainbow colors when sunlight falls on it? Or how exactly the microscopic lines on the back of 1 CD or DVD reflect light in such 1 highly colorful pattern? This is no magic trick, but it is 100 percent the scientific marvel of the interference and diffraction of light waves. When 2 or more light waves meet at exactly 1 single point, they can either magically combine to produce 1 highly bright spot or completely cancel each other to create perfect darkness.
From the strict perspective of the upcoming NCERT and RBSE board exams, this specific chapter of physics is highly scoring and extremely important for your 100 percent success. In the board exams, not only direct theoretical questions are asked from this chapter, but excellent analytical, numerical, and derivation-based questions on Huygens Principle, Young's Double Slit Experiment (YDSE), and the diffraction of light definitely appear in the final exam paper every single year without fail. In this highly exciting journey, we will 1st study the exact mathematical concept of wavefronts very closely. We will scientifically learn how spherical, cylindrical, and plane wavefronts strictly propagate through space.
Moving 1 little further in the chapter, we will logically analyze the fascinating phenomenon of Interference. We will deeply study Thomas Young's highly historical Double Slit Experiment, which successfully provided the 1st absolute 100 percent proof of the wave nature of light. We will logically calculate the exact fringe width of the bright and dark bands formed on the screen. After this, we will deeply study the highly important concept of Diffraction, which explains how exactly light waves successfully bend around extremely sharp corners or very tiny obstacles. We will clearly see how the diffraction pattern formed by 1 single narrow slit differs strictly from the interference pattern of 2 slits.
Finally, we will deeply understand the crucial phenomenon of Polarization. We will logically study how ordinary unpolarized sunlight vibrates in all possible directions, and how passing it through 1 special polaroid filter perfectly restricts its vibration to exactly 1 single plane. This exact principle is strictly used in expensive sunglasses to 100 percent block the blinding glare of the sun while driving. To perfectly ensure your excellent and 100 percent strong preparation, we have meticulously selected and prepared completely accurate, high-level, and highly exam-useful objective questions (MCQs) from all these complex topics. By continuously practicing again and again, you will surely learn critical time management and massively increase your speed of solving complex numerical questions without making even 1 single mistake.
Feature: This is 1 3-Level based unique quiz. To unlock the next level (Level 2 and 3), students must score at least 70% in the current level, making their board exam preparation 100% strong.
рдорд╣рддреНрд╡рдкреВрд░реНрдг рдкреНрд░рд╢реНрди (Important Questions)
PDF рдбрд╛рдЙрдирд▓реЛрдб рдХрд░реЗрдВрдЕрдзреНрдпрд╛рдп рдХреЗ рд╕рднреА рдкреНрд░рд╢реНрди (Revision Notes)
*рдиреЛрдЯ: рдпрд╣ рд╕реЗрдХреНрд╢рди рд░рд┐рд╡реАрдЬрди рдХреЗ рд▓рд┐рдП рд╣реИред рдЕрдкрдирд╛ рдЬреНрдЮрд╛рди рдкрд░рдЦрдиреЗ рдХреЗ рд▓рд┐рдП рдКрдкрд░ рджрд┐рдП рдЧрдП рдХреНрд╡рд┐рдЬрд╝ рдореЗрдВ рднрд╛рдЧ рд▓реЗрдВред
-
Huygens Principle is based on?
A) Particle nature | B) Wave nature | C) Both | D) None -
Who discovered Interference of light?
A) Newton | B) Thomas Young | C) Maxwell | D) Hertz -
Line perpendicular to wavefront is called?
A) Ray | B) Wave | C) Vibration | D) Flux -
Wavefront from a point source is?
A) Cylindrical | B) Spherical | C) Plane | D) None -
Polarization proves light is:
A) Longitudinal | B) Transverse | C) Fast | D) Scalar -
Colors in soap bubbles are due to?
A) Diffraction | B) Interference | C) Dispersion | D) Scattering -
Two sources are Coherent if:
A) Phase diff is constant | B) Freq is different | C) Velocity is different | D) None -
Bending of light around corners is?
A) Interference | B) Diffraction | C) Refraction | D) Polarization -
Fringes in Young's experiment are:
A) Equal width | B) Unequal | C) Only dark | D) Only bright -
Brewster's Law is related to?
A) Interference | B) Polarization | C) Diffraction | D) Reflection -
First event confirming wave nature of light:
A) Reflection | B) Interference | C) Refraction | D) Photoelectric effect -
All points on wavefront vibrate:
A) In phase | B) Out of phase | C) 90┬░ phase diff | D) Random -
Width of central maximum in single slit diffraction:
A) Minimum | B) Maximum | C) Zero | D) Constant -
Polarization is possible only in which waves?
A) Longitudinal | B) Transverse | C) Sound | D) None -
Effect of diffraction as ╬╗ increases:
A) Increases | B) Decreases | C) Remains same | D) Zero -
Path difference for Destructive Interference:
A) n╬╗ | B) (2n+1)╬╗/2 | C) ╬╗/4 | D) Zero -
Path difference for Constructive Interference:
A) n╬╗ | B) ╬╗/2 | C) (2n+1)╬╗/2 | D) None -
If Young's apparatus is immersed in water, fringe width:
A) Increases | B) Decreases | C) Same | D) Disappears -
Who gave Corpuscular theory of light?
A) Huygens | B) Newton | C) Young | D) Maxwell -
Malus Law says intensity (I) depends on:
A) cos╬╕ | B) cos┬▓╬╕ | C) sin╬╕ | D) tan╬╕ -
Main difference between diffraction and interference:
A) Diffraction from same wavefront | B) Diffraction from different sources | C) Same | D) None -
Reflected light at Brewster angle (Ip) is:
A) Fully polarized | B) Unpolarized | C) Partially polarized | D) Colored -
Resolving power of microscope as ╬╗ increases:
A) Increases | B) Decreases | C) Independent | D) Zero -
Plane wavefront is obtained from:
A) Nearby point source | B) Source at infinity | C) Linear source | D) None -
Secondary wavelets travel at:
A) Speed of light | B) Speed of sound | C) Static | D) Zero -
If intensity ratio is 9:1, amplitude ratio is:
A) 3:1 | B) 81:1 | C) 9:1 | D) 1:3 -
Maxwell proved light travels in vacuum because it is:
A) Electromagnetic | B) Mechanical | C) Scalar | D) Static -
Polaroids are used in:
A) Reducing glare | B) 3D movies | C) Cloud photography | D) All of the above -
Importance of Fresnel distance:
A) Limit of ray optics | B) Interference | C) Refraction | D) None -
What if one slit is closed in Young's experiment?
A) Interference pattern gone | B) Brighter pattern | C) Diffraction visible | D) A and C both -
╬╗=600nm, D=2m, d=1mm. Fringe width (╬▓) is?
A) 1.2 mm | B) 0.6 mm | C) 1.2 cm | D) 0.12 mm -
Intensity ratio 4:1. Imax/Imin is?
A) 9:1 | B) 5:3 | C) 4:1 | D) 2:1 -
Ip=60┬░. n (tan Ip) is?
A) 1.5 | B) 1.732 (тИЪ3) | C) 1.33 | D) 1.414 -
500nm light on 0.2mm slit. Angle of 1st minimum?
A) 0.0025 rad | B) 0.25 rad | C) 2.5 rad | D) Zero -
Phase difference for path diff ╬╗/3?
A) 60┬░ | B) 120┬░ (2╧А/3) | C) 180┬░ | D) 90┬░ -
Distance of 5th bright fringe in YDSE:
A) 5╬╗D/d | B) ╬╗D/5d | C) 4.5╬╗D/d | D) 5.5╬╗D/d -
Unpolarized IтВА on polaroid. Out intensity?
A) IтВА | B) IтВА/2 | C) IтВА/4 | D) Zero -
Relation between v, f and ╬╗:
A) v = f╬╗ | B) f = v╬╗ | C) ╬╗ = vf | D) v = f/╬╗ -
Resolving limit and resolving power relation:
A) Directly proportional | B) Inversely proportional | C) No relation | D) Same -
Phase diff ╧А, same amplitudes. Resultant intensity?
A) Maximum | B) Zero | C) Constant | D) Infinite -
Phase difference for Dark fringe:
A) ╧А, 3╧А, 5╧А... | B) 0, 2╧А, 4╧А... | C) ╧А/2 | D) Zero -
Resolving limit of telescope:
A) 1.22 ╬╗/D | B) D/1.22 ╬╗ | C) ╬╗/D | D) D/╬╗ -
Angular width of central max in single slit:
A) ╬╗/d | B) 2╬╗/d | C) ╬╗/2d | D) Zero -
Sum of Ip and r (refraction angle) is:
A) 45┬░ | B) 90┬░ | C) 180┬░ | D) 0┬░ -
Increase resolving power by immersing object in:
A) Oil immersion | B) Water | C) Air | D) Vacuum
0
0
0%
рдЕрдкрдирд╛ рд╕реБрдЭрд╛рд╡ рджреЗрдВ (Feedback)
рд╡реЗрдмрд╕рд╛рдЗрдЯ рдХреЛ рдФрд░ рдмреЗрд╣рддрд░ рдмрдирд╛рдиреЗ рдХреЗ рд▓рд┐рдП рдЕрдкрдиреЗ рд╡рд┐рдЪрд╛рд░ рд╣рдореЗрдВ рднреЗрдЬреЗрдВред