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Question

The object and the image distances are 10 cm & 30 cm respectively for a lens. Image is formed on same side of the object then the focal length is .

A
25 cm
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B
10 cm
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C
+ 15 cm
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D
15 cm
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Solution

The correct options are
C + 15 cm
D 15 cm

Given below
Image distance v = 30 cm, (using the sign conventions)
Object distance u = 10 cm (using the sign conventions)

1v1u=1f
130110=1f
f=15 cm
Here, positive sign shows that the lens is convex.


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