Image produced by a concave mirror is one quarter the size of the object. If the object is moved b = 5 cm closer to the mirror the image will only be half the size of the object. Focal length of the mirror is ….× 10 –1 cm.
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Ans. 0002
Sol.
m = – 
; 4v = u …(1)
; m = – 
⇒ u 1 = 2v 1
u 1 = 3f …(2)
⇒ 
u = 5 f …(3)
u – u 1 = 5
5f – 3f = 5 ⇒ f = 2.5 cm
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