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Grade 1010 grade science

A converging beam of rays is incident on a diverging lens.Having passed through the lens the rays intersect at a point 15cm from the lens on the opposite side.If the lens is removed the point where the rays will meet will move 5cm closer to the lens.The focal length of the lens is ?

SUDHARSANA V V

8 Years agoGrade 10

2 Answers

Arun

Approved Tutor Answer8 Years ago

Dear student

Given,
Image distance, v=15 cm
Object distance, u=15-5=10 cm (It is the distance when lens is removed. i.e object distance)
Now,
Using formula,
1/v-1/u=1/f
or 1/f=1/15 -1/10
or f=-30 cm

Regards

Arun (askIITians forum expert)

Rishi Sharma

5 Years ago

Dear Student,
Please find below the solution to your problem.

Given,
Image distance, v=15 cm
Object distance, u=15-5=10 cm
(It is the distance when lens is removed. i.e object distance)
Now, Using formula,
1/v-1/u=1/f
or
1/f=1/15 -1/10
or
f=-30 cm

Thanks and Regards

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