Question

What should be the focal length of a convex lens when an object of height 5 cm kept at a distance of 12cm away from it gives a real inverted image of height 5 cm
please answer fastt

Answer 1

Answer:

Given,

Height of object =5cm

Position of object, u=−25cm

Focal length of the lens, f=10cm

Position of image, v=?

We know that,

v1−u1=f1

v1+251=101

v1=101−251

So,

v1=50(5−2)

That is,

v1=503

So,

v=350=16.66cm

Thus, distance of image is 16.66cm on the opposite side of lens.

Now, magnification =uv

That is,

m=−2516.66=−0.66

Also,

m=he

Answer 2

Answer:

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