Question

the minimum distance between the object and its real image formedvby a convex lens is 40 cm .What is the focal lenght?
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Answer 1

Explanation:

minimum distance between object and it's real image is 40

it is possible when the object distance= image distance

so,the object on center of curvature

radius of curvature= 20

focal length= 20/2=10

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Answer 2

Thus the focal length of the convex lens is f = 10 cm

Explanation:

We are given that:

Minimum distance = 40 cm

Solution:

• Minimum distance between object and it's real image = 40 cm
• Now let's say that the object distance= image distance
• From given information we can infer that the object is on center of curvature.
• Radius of curvature= 20 cm
• As we know that radius of curvature is equal to twice of focal length.

Focal length= 20 / 2 = 10

Thus the focal length of the convex lens is f = 10 cm