A convex lens of focal length is used as a simple magnifier
PHYSICS · Single correct · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments
Problem
A convex lens of focal length f=5cm is used as a simple magnifier. Two object positions are tried:
(a) Case (ii) causes less strain because the angular size of the image is greater.
(b) Case (i) causes less strain because the eye views an image nearly at infinity.
(c) Case (ii) causes practically no strain since the image forms at the least distance of distinct vision (≈25cm).
(d) Case (i) actually causes more strain since the eye has to focus on a very distant image.