Using the data given below, state which two of the given lenses will you prefer to construct a best possible (i) telescope (ii) microscope. Also, indicate which of the selected lenses is to be used as an objective and as an eye piece in each case Lenses,`L_1, L_2,L_3` Power(P), 6 D,3 D, 10 D Aperture (A), 1 cm, 8 cm, 1 cm.

Using the data given below, state which two of the given lenses will y

1.	Using the data given below, state which two of the given lenses will you prefer to construct a best possible (i) telescope (ii) microscope. Also, indicate which of the selected lenses is to be used as an objective and as an eye piece in each case Lenses,`L_1, L_2,L_3` Power(P), 6 D,3 D, 10 D Aperture (A), 1 cm, 8 cm, 1 cm.
Answer» For a telescope, lens `L_2` is chosen as objective, as its aperture is largest. The lens `L_3` is chosen as eye piece as its focal length is smallest. For a microscope, lens `L_3` is chosen as objective because its focal length is smallest. Lens `L_1` serves as eye piece because its focal length is not largest. This is required to secure greater magnifying power of the microscope.

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