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The Plane face of the Plano convex lens of focal length 20cm is silverd. What type of mirror will it behave and of what focal length? A-convex, f=20cm vice versa. B-convex focal length 10cm or vice-versa 

Asked by Priyanka 13th November 2017, 9:43 PM
Answered by Expert
Answer:
begin mathsize 24px style 1 over F equals 2 over f plus 1 over f subscript c


f c equals space f o c a l space l e n g t h space o f space t h e space p l a n e space s u r f a c e space equals infinity
F equals f o c a l space l e n g t h space o f space p l a n o space c o n v e x space l e n s equals 20 space c m

fraction numerator begin display style 1 end style over denominator begin display style F end style end fraction equals fraction numerator begin display style 2 end style over denominator begin display style f end style end fraction plus fraction numerator begin display style 1 end style over denominator begin display style infinity end style end fraction space
fraction numerator begin display style 1 end style over denominator begin display style 20 end style end fraction equals fraction numerator begin display style 2 end style over denominator begin display style f end style end fraction

space f equals 40 c m space a n d space c o n c a v e space
P l e a s e space c h e c k space y o u r space o p t i o n s space p r o p e r l y




end style
Answered by Expert 6th December 2017, 4:53 PM
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