04'6\"\" 2 An object is placed at a distance of 40 cm from a thin lens along the principal axis. if a virtual image forms at a \"our\" d distance 01'50 cm from the lens, on the same side as the object, then the focal length of the lensr to the nearest answere -'- Marked out of centimetre. Is -_ _- cm. 1.00 l." Flag question Question 3 hot vet answered Marked out of 1.00 i." Fag queszion S: and 32 produce waves with a wavelength of 8 cm. These waves are initially one-half wavelength out of phase. 44 cm |.I 32 cm The waves at point P will show: Select one: Oa. Ob. Oc. Q d. standing waves It is impossible to tell from the information given. destructive interference constructive interference Question 4 hot yet answe re cl Marked out of 1.00 '2' Ffag question One of the observations of a doubleslit experiment is an interference pattern in which the distance from the central maximum to the firstorder bright fringe is X. ff the wavelength of the light and the slit separation were both doubled. what would be the distance between the central maximum and the first-order bright fringe? Select one; 0 a. 2X 0 b. X 0 c. N4 0d. 4X memo" 5 A diffraction grating with slits 0.020 mm apart produces an interference pattern on a screen 0.80 m away. If the bright lines are '18 mm apart; the wavelength ofthe light used is ab: x 10d meters. The values of a, b, c, and d (in that order} are l I l, and I l. h' of yet answere d r r Mar'ked out of 1.00 l" Flag