If initially a small object is placed normal to principal axis at 30 cm from concave mirror of focal length 20 cm. Now it is shifted to new position (2) such that image formed is virtual with magnification '2'.
(i)Initially image formed by mirror is separated from object by –
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Ans.
(i)
Sol.
∴ v = – 60 cm
∴ separation between image & object
= |60 – 30|
= 30 cm
(ii)
Sol. m = 
+ 2 = 
– 40 = – 20 – v
∴ v = 20 cm
(iii)
Sol. m = 
= 
∴ m = 
= – 2 & M = – m 2 = – 4
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