A small object (A) is placed on the principal axis of an equiconvex lens at a distance of 30 cm. The refractive index of the glass of the lens is 1.5 and its surfaces have radius of curvature `R = 20 cm`. Two glass slabs S1 and S2 have been placed behind the lens as shown in Figure. Thickness of the two slabs is 6 cm and 4 cm respectively and their refractive indices are `(3)/(2)` and 2 respectively.
(a) Find the distance of the final image measured from the lens. Also find the magnification.
(b) How does the position of the image change if the slab S2 is moved to left so as to put it in contact with S1.
(c) How does the position of the image change if the two slabs in contact are together moved to right by a distance of 100 cm.

Answer

(a) `60 cm; m =- 2` (b) No change (c) No change