CBSE Class 10 Science 2019 · Paper 31/4/3 · Question 3(a)
List four characteristics of the image formed by a convex lens of focal length 20 cm when the object is placed in front of it at a distance of 10 cm from its optical centre.
Answer
The image is virtual, erect, magnified twice () and formed on the object's side, 20 cm from the lens, at .
The object ( cm from the lens) is inside the focal length ( cm), so the image is:
(i) Virtual: it cannot be obtained on a screen.
(ii) Erect.
(iii) Magnified: twice the size of the object ().
(iv) On the same side of the lens as the object, cm from the lens ( cm), that is, at the focus .
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