Question

An object is 4 cm in front of a system of two converging lens' each of focal length 10 cm and separated by distance of 20 cm. The image is : A. Virtual and erect B. Erect and the same size as the object C. Reduced O D. Inverted and enlarged

Answer 1

lens 2 leus! object 조 44cm 20cm for lens! - -1 do =-4cm f = +10cm ! di do F, do > di = f, do dotf, magnification - -) dia + (10)(-4) (-4)+(10) - 20 3 cm from lens! m = di do Now, for lensa (-20/3) (-4) do -(20 + :) : 80 f=+10cm 2 di fz do dotfr (10)(-) ( - )+(10) + 16 cm magnification from lens 2 m, di - (16) (-80/3) - 3 5 Het magnification, m- m, xmz 3 why X = -1 ANSWER Image is Inverted and same size as object