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Question

A symmetrical double convex lens is cut in two equal parts vertically, If the length of the original lens was 4 cm.

then what will be the focal length of the cut lens ?

A
5
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B
9
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C
6
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D
8
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Solution

The correct option is D 8
If a symmetrical double convex lens is cut into two equal parts vertically,
then the focal length of cut lens is doubled.
Since ,focal length of original double convex lens =4 cm.
Then,
Focal length of cut lens =4×2=8 cm.

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