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Image Formation by Convex Lens

a biconvex le...

Question

a biconvex lens of glass is cut into 2 equal halves perpendicular to its principal axis and it is immeresed into water then how many times its focal length be changed than original

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Solution

Dear Student,

$b y c u t t i n g t h e l e n s f r o m i t s p r i c i p a l a x i s d o e s n o t c h n a g e i t s f o c a l l e n g t h b u t r e d u c e t h e a p e r t u r e o f t h e l e n s h e n c e t h e i n a g e f o r m w i l l b e b l u r . l e t t h e r e f r t i v e i n d e x o f t h e w a t e r b e l e s s t h a n t h a t o f l e n s . i f w e e i m m e r s e d t h e l e n s i n t h e w a t e r t h e n t h e f o c a l l e n g t h w i l l i n c r e a s e s a s t h e r e l a t i v e r e f r a c t i v e i n d e x o f t h e l e n s w i l l d e c r e a s e . R e g a r d s$

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