Magnification
Magnification is a Science & Technology concept from the MPSC syllabus, tested in 2 past MPSC questions (2018). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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Real questions that test this
1 मिमी × 1 मिमी च्या चौरसाची नक्षी असलेले कार्ड शीट, डोळ्यांच्या अगदी जवळ असलेल्या 9 सेमी नाभीय अंतराच्या बहिर्वर्क भिंगातून 9 सेमी अंतरावरून बघितल्यास, त्या कार्ड शीट वरील चौरस ________ आकाराचे दिसतील. A card sheet divided into squares, each of size 1 mm × 1 mm is being viewed at a distance of 9 cm through a convex lens of focal length 9 cm held close to the eye. The squares on the card sheet will be observed to be of size
When object distance equals focal length of a convex lens, the image is formed at infinity, making the calculation straightforward based on magnification formulas.
एका वस्तूची उंची 3 सेमी असून 24 सेमी वक्रता त्रिज्या असणाऱ्या अंतर्वक्र आरशापासून 20 सेमी अंतरावर ठेवली आहे. सुस्पष्ट प्रतिमा मिळवण्यासाठी आरशापासून पडदा किती अंतरावर असावा ? तसेच प्रतिमेचा आकार किती ? / An object 3 cm in size is placed 20 cm in front of a concave mirror of radius of curvature 24 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image ? Also, what is the size of the image ?
Using mirror formula 1/f = 1/v + 1/u with R=24 cm (f=-12 cm) and u=-20 cm, we find v=-30 cm. Magnification gives the image size as -4.5 cm.