Q.

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

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a

1 : 1

b

1 : 2

c

2 :  1

d

2 : 12

answer is A.

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Detailed Solution

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