A compound microscope is an instrument which consists of two lenses L1 and L2. The lens L1 called objective, forms a real, inverted and magnified image of the given object. This serves as the object for the second lens L2; the eye piece The eye piece function like a simple microscope or magnifier. It produces the final image, which is inverted with respect to the original object, enlarged and virtual.(i) What types of lenses must be L1 and L2? (a) Both concave (b) Both convex (c) L1 — concave and L2 — convex (d) L1 — convex and L2 — concave(ii) What is the value and sign of magnification (according to the new Cartesian sign convention) of the image formed by L1? (a) Value = Less than 1 and Sign = Positive (b) value = More than 1 and Sign = Positive (e) value = Less than 1 and Sign = Negative (d) value = More than 1 and Sign = Negative(iii) What is the value and sign of (according to new Cartesian sign convention) magnification of the image formed by L2? (a) value = Less than 1 and Sign = Positive (b) value = More than 1 and Sign = Positive (c) Value = Less than 1 and Sign = Negative (d) Value = More than 1 and Sign = Negative(iv) If power of the eyepiece (L2) is 5 diopters and it forms an image at a distance of 80 cm from its optical centre, at what distance should the object be? (a) 12 cm (b) 16 cm (c) 18 cm (d) 20 cm