Tiêu đề 3.WAVE OPTICS FINAL.pmd.pdf ✅

92 NISHITH Multimedia India (Pvt.) Ltd., JEE ADVANCED - VOL - V NISHITH Multimedia India (Pvt.) Ltd., WAVE OPTICS (A) If 7 2 d   , the point ‘O’ will be minima. (B) If d   , only one maxima canbe observed on screen (C) If d  4.8 ,then a total 10 minimas would be there on screen. (D) If 5 2 d   , then Intensity at ‘O’ would be minimum. 17. The minimum value of ‘d’ so that there is a dark fringe at ‘O’ is min d . For the value of min d the distance at which the next bright fringe is formed is x. Then A P O O ' B x D D d (A) d D min   (B) min 2 D d   (C) min 2 d x  (D) min x d  COMPREHENSION TYPE Comprehension-I: In the arrangement shown in figure, slits S3 and S4 are having a variable separation Z. Point ‘O’ on the screen is at the common perpendicular bisector of S1 S2 and S3 S4 . (Assume D>>>d). D D O A O ' 1 S 2 S 3 S 4 S Z d 18. When 2 D Z d   the intensity meausred at ‘O’ is 0 I . The intensity at ‘O’ when 2 D Z d   is (A) 0 I (B) 0 2I (C) 0 3I (D) 0 4I 19. The minimum value of Z for which the intensity at ‘O’ is zero is (A) 3 2 D d  (B) 2 D d  (C) 3 D d  (D) D d  20. If a hole is made at O' on AO O' and the slit 4 S is closed then the ratio of the maximum to the minimum observed on screen at ‘O’ if 3 O S' is equal to 4 D d  is (A) 1 (B) Infinity (C) 34 (D) 4 Comprehension-II: A monochromatic beam of light falls on Young’s double slit experiment apparatus as shown in figure. A thin sheet of glass is inserted in front of lower slit 2 S (   600nm is wavelength of source) O d S1 S2 d D   t  21. The central bright fringe can be obtained (A) At ‘O’ (B) At ‘O’ or below ‘O’ (C) at ‘O’ or above ‘O’ (D) Any where on the screen 22. If central bright fringe is obtained onscreen at ‘O’ then (A)     1 sin t d (B)     1 cos t d (C)   t d   (D)  1 sin  t d    