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Dear Student
using lens formula we have

\frac{1}{v} - \frac{1}{u} = \frac{1}{f} \frac{1}{v} = \frac{1}{10} - \frac{1}{30} = \frac{1}{15} h e n c e f r o m c o n c a v e l e n s i t s d i s \tan c e i s 10 c o m w h i c h i s f o c u s o f c o n c a v e l e n s h e n c e a f t e r i n t e r a c t i o n f r o m c o n c a v e l e n s r a y s b e c o m e s p a r a l l e l t o p r i n c i p l e a x i s a n d t h e n f i n a l l y i n t e r a c t w i t h c o n c e x l e n s a n d i m a g e f o r m e d a t 30 c m f r o m l a s t c o n v e x l e n s R e g a r d s

​plz answer this question