Match the LIST-I with LIST-II
| LIST-I | LIST-II | ||
| (Instrument) | (Characteristics) | ||
| A. | Simple magnifier | I. | The eyepiece is smaller than the objective lens |
| B. | Prism | II. | Converging lens of small focal length |
| C. | Compound Microscope | III. | Dispersion |
| D. | Telescope | IV. | The eyepiece is of larger focal length than the objective lens |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → A-II, B-III, C-IV, D-I
Each instrument is recognised by what its lenses (or the prism) do, and in particular by the focal lengths of objective and eyepiece.
(A) Simple magnifier — this matches (II) Converging lens of small focal length. Its magnification \( m = 1 + D/f \) is large only when f is small.
(B) Prism — this matches (III) Dispersion. A prism deviates different wavelengths by different amounts and splits white light into colours.
(C) Compound Microscope — this matches (IV) The eyepiece is of larger focal length than the objective lens. The objective has a very short focal length so that it forms a large real image of a nearby object, which the eyepiece then magnifies.
(D) Telescope — this matches (I) The eyepiece is smaller than the objective lens. The objective has a large aperture and long focal length to gather light from distant objects, and the magnification \( f_o/f_e \) needs a small eyepiece.