An object 3 cm high is kept in front of a concave mirror of focal length 30 cm. Where should the screen be placed to form a 2 times magnified sharp image on the screen ?

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$T o f o r m a r e a l a n d m a g n i f i e d i m a g e o b j e c t s h o u l d b e p l a c e d b e t w e e n t h e f o c u s a n d t h e c e n t r e o d c u r v e t u r e . S o i m a g e f o r m e d i s i n v e r t d a n d i t s m a g n i f i c a t i o n i s n e g a t i v e f o r m u l a o f m a g n i f i c a t i o n m = \frac{f - v}{f} - 2 = \frac{- 30 - v}{- 30} 60 = - 30 - v v = - 90 c m s o s c r e e n s h o u l d b e p l a c e d a t 90 c m f r o m t h e m i r r o r o n t h e s a m e s i d e a s t h a t o f t h e o b j e c t . R e g a r d s$

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