plz answer this question its very imp.
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Sorry friend I try to solve it but I can't I hope any other user will definitely help u
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m = = -1
v = -u ...................(a)
v-u = 60 { distance b/w image and object }..................(1)
put (a) in (1)
∴ -u-u = 60cm
-2u = 60cm
-u = 30cm
u = -30cm (put in (a))
v = - (-30)
v = 30cm
∵ lens formula
15cm = f
= -10cm ( new object distance )
∴ f is always same
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