NCERT Exercise 9.9 - Ray Optics and Optical Instruments
Question: An object of size 3.0cm is placed 14cm in front of a concave lens of focal length 21cm. Describe the image produced by the lens. What happens if the object is moved further away from the lens?
Answer: **NCERT answer:** v = 8.4 cm, image is erect and virtual. It is diminished to a size 1.8 cm. As u → ¥, v → f (but never beyond f while m → 0). Note that when the object is placed at the focus of th...
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