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1 Phone : , Optics Page: 1 fo/u fopkjr Hkh# tu] ugha vkjehks ke] foifr ns[k NksM+s rqjar e/;e eu j ';kea iq#"k flag layi j] lgrs foifr vus] ^cuk^ u NksM+s /;s; ks] j?kqcj jk[ks VsAA jfpr% ekuo /kez iz.ksrk ln~xq# Jh j.knksm+nklth egkjkt OPTICS Some questions (Assertion Reason type) are given below. Each question contains STATEMENT 1 (Assertion) an (Reason). Each question has 4 choices (A), (B), (C) an (D) out of which ONLY ONE is correct. So select the correct choice : Choices are : (A) Statement 1 is True, Statement 2 is True; Statement 2 is a correct explanation for Statement 1. (B) Statement 1 is True, Statement 2 is True; Statement 2 is NOT a correct explanation for Statement 1. (C) Statement 1 is True, Statement 2 is False. (D) Statement 1 is False, Statement 2 is True STATEMENT 1 Light can show interference. Light can show iffraction STATEMENT 1 For observing traffic at our back, we prefer to use a convex mirror. A convex mirror has a more larger fiel of view than a plane mirror or concave mirror STATEMENT 1 Spherical aberration is a efect of a spherical mirror, in which not all rays focus at a single point. The laws of reflection are not vali for all rays STATEMENT 1 In passing through a lens or prism, the phase ifference between two waves oes not change. The optical path lengths of all rays are same STATEMENT 1 A convex lens may be iverging. The nature of a lens epens upon the refractive incies of the material of lens an surrouning meium besies geometry STATEMENT 1 The power of a thin lens oes not epen upon the surrouning meium. Power of a thin lens =. f 362. STATEMENT 1 If white light is use in YDSE, coloure fringes are obtaine. The fringe with is proportional to the wavelength (color) of light.

2 Phone : , Optics Page: STATEMENT 1 When a soun wave in air is reflecte from a wall, it oes not suffer a phase charge. For soun waves, air is enser as compare to wall STATEMENT 1 The two slits in YDSE are illuminate by two ifferent soium lamps emitting light of same wavelength. No interference pattern will be observe. Two inepenent light sources (except LASER) cannot be coherent STATEMENT 1 A virtual image can be photographe. Only a real image can be forme on a screen STATEMENT 1 The focal length of a lens oes not epen on the meium in which it is submerge =. f 1 R1 R STATEMENT 1 The minimum slit separation for interference to prouce at least one maximum other than central maximum in YDSE is 3λ. For a maximum, path ifference = nλ. The maximum value of path ifference =, slit separation STATEMENT 1 In calculating the isturbance prouce by a pair of superimpose incoherent wave trains, you can a their intensities. I 1 + I I1I2 cosδ. The average value of cos δ = 0 for incoherent waves STATEMENT 1 A single lens cannot be free from chromatic aberration. When light passes through single lens ispersion must occur STATEMENT 1 Superposition takes place only between those waves emitte by coherent sources. All coherent sources emit energy in proper orer STATEMENT 1 When a glass prism is immerse in water, the eviation cause by prism ecreases. Refractive inex of glass prism relative to water is less than relative to air STATEMENT 1 An air bubble in water shines. When light is incient from water to air, total internal reflection takes place at outer surface of bubble.

3 Phone : , Optics Page: STATEMENT 1 Thin films such as soap bubble or thin layer of oil sprea on water show beautiful colors when illuminate by white light. It is ue to interference of Sun s light reflecte from upper an lower surfaces of the film STATEMENT 1 In YDSE central fringe is always a bright fringe. If path ifference at central fringe is zero then it will be a bright fringe STATEMENT 1 When white light passes through a prism, eviation of violet light is more than green light. In a prism average eviation is measure as eviation of yellow light STATEMENT 1 A real object is kept on principle axis of mirror. Size of image measure is equal to size of object. The mirror must be plane mirror. For a plane mirror magnification is unity STATEMENT 1 : Different colours travel with ifferent spee in vacuum : Wavelength of light epens on refractive inex of meium STATEMENT 1 : We can not prouce a real image by plane or convex mirrors uner any circumstances. : The focal length of a convex mirror is always taken as positive STATEMENT 1 : A fish insie a pon will see a person staning outsie taller than he is actually. : Light ben away from the normal as it enters water from air STATEMENT 1 : Hollow prism forms no spectra as a soli equilateral prism of glass. : Neglecting the thickness of hollow glass surface. The meia is same. So ispersion is not to take place STATEMENT 1 : In Young s ouble slit experiment if whole set up is immerse in a liqui then fringe with is ecrease. : Wavelength of light entering in a liqui increases STATEMENT 1 : A light ray is incient on a glass slab. Some portion of it is reflecte an some is refracte. Refracte an reflecte rays are always perpenicular to each other. : Angle of incience is equal to angle of reflection STATEMENT 1 : The critical angle in case of total internal reflection epens on the pair of meium chosen. : The critical angle in case of total internal reflection is inepenent of pair of meium chosen STATEMENT 1 : If we increase the separation, between slits, then angular fringe with ecreases. : Angular fringe with increases by increasing slit separation.

4 Phone : , Optics Page: STATEMENT 1 : A concave mirror has f = 40 cm in air. It has f = 30 cm in water. : Focal length of mirror is inepenent of meium STATEMENT 1 :Air bubble in glass meium behaves as concave lens. 1 lens 1 1 : Lens formula is = 1. f me R1 R STATEMENT 1 : Interference phenomena is base upon conservation of energy principle. : All the bright fringes are of the same intensity in YDSE STATEMENT 1 : Angular with of central maximum in YDSE is inepenent of D i.e., istance between source an screen. : Fringe with of central maximum is ouble of the first maxima on the screen STATEMENT 1 : In Young s ouble slit experiment interference pattern isappears when one of the slits is close. : Interference occurs ue to superimposition of light wave from two coherent sources STATEMENT 1 : Power of a lens epens on nature of material of lens, meium in which it is place an raii of curvature of its surface. : It follows the relation p = = 1 f 1 R1 R STATEMENT 1 : Law of reflection is applicable for all type of mirrors. : Rays which are parallel to principle axis are known as paraxial rays STATEMENT 1 : In Young s ouble slit experiment if intensity of each source is I 0 these minimum an maximum intensity is zero an 4I 0 respectively. : In Young s ouble slit experiment energy conservation is not followe STATEMENT 1 : Image forme by a convex mirror is always smaller in size. : It is always virtual STATEMENT 1 : Fringe with epens upon refractive inex of the meium. STATEMENT 2 :Refractive inex changes optical path of ray of light forming fringe pattern. 395 STATEMENT 1 : The images forme by total internal reflections are much brighter than those forme by mirrors or lenses. : There is no loss of intensity in total internal reflection STATEMENT 1 : In Young s experiment, the fringe with for ark fringes is same as that of the white fringes. : In Young s ouble slit experiment the fringes are performe with a source of white light, then only black an bright fringes are observe STATEMENT 1 : The focal length of lens oes not change when re light is replace by blue light. : The focal length of lens epens on the colour of light use STATEMENT 1 : A convex lens of focal length f( = 1.5) behaves as a iverging lens when immerse in carbon i-sulphie of higher refractive inex ( = 1.65). : The focal length of lens oes not epen on the colour of light use STATEMENT 1 : When a light wave travels from a rarer to a enser meium, it loses spee. The reuction in spee implies a reuction in energy carrie by the light wave.

5 Phone : , Optics Page: 5 : The energy of a wave is proportional to wave frequency STATEMENT 1 : In interference all the fringes are of same with. : In interference, fringe with is inepenent of position of fringe. Hint & Solution 356. (B) 357. (A) 358. (C) 359. (C) 360. (A) 361. (D) 362. (D) 363. (A) 364. (A) 365. (B) 366. (D) 367. (D) 368. (A) 369. (A) 370. D 371. (A) 372. (A) 373. (A) 374. (D) 375. (B) 376. (D) 377. (D) 378. (D) 379. (C) 380. (A) 381. (C) 382. (D) 383. (C) 384. (C) 385. (D) 386. (A) 387. (C) 388. (C) 389. (A) 390. (A) 391. (C) 392. (C) 393. (B) 394. (B) 395. (A) 396. (C) 397. (D) 398. (B) 399. (D) 400. (A) 356. Conceptual The nature of the image forme ue to a convex mirror oes not change with changing istance of the object. It is always virtual, error an smaller Since reflection is at a bounary the other sie of which is rarer. no phase change The rays of light are iverging out from a virtual image. These can be easily converge onto the film of a concave lens by convergent action of its lens As can be seen from the expression of f, it epens upon the refractive inex of the meium in which the lens is submerge x = = nλ For n = 1, = λ an we will have three maximum. t= T cos( φ φ )t 1 2 t t Average value of cos δ = = =. Here φ 1 an φ 2 are constantly ranomly, fluctuating T phases of the two wave trains an integral is taken over a long time (relative to perios of the iniviual waves) The velocity of light of ifferent colours (all wavelength) is same in vacuum an 1 λ We can prouce a real image by plane or convex mirror. I O \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ O (Real Image) Focal length of convex mirror is taken positive (Real Image)

6 Phone : , Optics Page: Since light bens towars normal on entering water from air λ D n β ' = λair λair λ m = β ' = D ; ' β β = sin i = sin r = sin (90 i) sin i = cos i tan i = So reflecte an reflecte rays are perpenicular if tan i =. i i r 90º 383. θ C = sin 1 (1/). an is taken relative, hence it epens on pair of meium chosen Angular fringe with is inversely proportional to separation both slits For air bubble glass meium is enser an i = glass 1 ( ) 3 2 is < 1 value Angular with θ λ θ =. = fringe with D 389. When one of the slits is close, there appears general illumination from a single source. Interference oes not take place Both statement I an statement II are true an correct explanation Rays which are near an parallel to principal axis are known as paraxial rays In Young s ouble slit experiment energy remains conserve Wavelength in a meium of refractive inex λ λ ' = where λ is wavelength in air. Fringe with ω = λ D % of incient light is reflecte back into the same meium, an there is no loss of intensity, while in reflection from mirrors an refraction from lenses, there is always some loss of intensity. Therefore, images forme by total internal reflection are much brighter than those forme by mirrors or lenses In Young s experiments fringe with for ark an white fringes are same while in Young s ouble slit experiment when a white light as a source is use the central fringe is bright aroun which few colore fringes are observe on either sie.

7 Phone : , Optics Page: =. f R1 R 2 As b > R fb < fr Therefore focal length of lense ecreases when re light is replace by blue light The focal length of a Lens is given by formula ( 1) g Since = = cs From = ( 1) f < 0 f R1 R 2 Therefore the lens behaves as a iverging lens. Hence (B) is correct option When a light wave travels from a rarer to a enser meium it loses spee, but energy carrie by the wave oes not epen on its spee As given in the expression fringe with λd β =, fringe with β is inepenent of n (position).

12/2/2010. Chapter 27 Interference and the Wave Nature of Light

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