Q40. The figure shows a double-slit experiment. P and Q are the slits. The path lengths PX and QX are nλ and (n+2)λ respectively, where n is a whole number and λ is the wavelength. Taking the central fringe as zero, what is formed at X:Physics — Optics, Nature of Light and Optical Instruments — Question 40 of 155A. First brightB. First darkC. Second brightD. Second darkPractice more Physics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →