question_answer

An equiconvex lens of glass of focal length 0.1 metre is cut along a plane perpendicular to principle axis into two equal parts. The ratio of focal length of new lenses formed is [MP PET 1999; DPMT 2000]

A)            1 : 1                                          

B)            1 : 2

C)            2 :  1                                         

D)            2 :\[\frac{1}{2}\]

Correct Answer: A

Solution :

                              Ratio of focal length of new plano convex lenses is 1 : 1