CBSE Class 10 Science 2019 · Paper 31/1/1/C · Question 11(a)
How far should an object be placed from a convex lens of focal length 20 cm to obtain its real image at a distance of 30 cm from the lens ? Determine the height of the image if the object is 4 cm tall.
Answer
The object is placed 60 cm in front of the lens; the image is real, inverted and 2 cm tall.
The object should be placed cm in front of the lens ( cm). The image is cm tall and inverted ( cm, ).
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