Consider an optical instrument which uses only one converging lens to observe a small…
PHYSICS · Subjective · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments
Problem
Consider an optical instrument which uses only one converging lens to observe a small insect kept 8cm from the lens. The lens forms a virtual image of the insect at the observer’s near point.
(a) Identify the instrument.
(b) State the nature (real/virtual, erect/inverted) of the image formed.
(c) If the same lens were to be used as the eyepiece of a two-lens instrument whose objective produces a real intermediate image 15cm from the eyepiece, explain how the sequence of images would differ from part (b). Support your answer with a clearly labelled sketch.