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Grade 10IIT JEE Entrance Exam

The plane face of a plane convex of focal length 20cm is soldered.the lens will then behave as a concave mirror of focal length?

Profile image of Bhumika
8 Years agoGrade 10
Answers icon

1 Answer

Profile image of Arun
6 Years ago
Since net power of a silvered lens is
          
7
1
​ 
 = 
f 
lens
​ 
 
−2
​ 
 + 
f 
mirror
​ 
 
1
​ 
 
hence according to question
          
7
1
​ 
 = 
20
−2
​ 
 = 
20
1
​ 
 = 
20
−1
​ 
 
              
f=−20cm
​ 
 

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