A convex lens of radii of curvature 20 cm and 30 cm respectively. It is silvered at the surface which has smaller radius of curvature. Then if will behave as ( 
):
A
Concave mirror with equivalent focal length 
cm
cm
B
Concave mirror with equivalent focal length 
cm
cm
C
Concave mirror with equivalent focal length 
cm.
cm.
D
Concave mirror with equivalent focal length 
cm.
cm.
Text Solution
Verified by ExpertsThe correct answer is:
B
: Focal length for lens
Here, 
or 
Focal length for mirror
Equivalent focal length
Hence, this system begaves like a concave mirror of focal length 
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