Question

An object is placed at a distance of 10 cm on the principal axis of a convex lens whose focal length is less than 10 cm then the image of it observed at a distance of 30 cm from the lens .find the nature of magnification of image

Answer 1

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Answer 2

Image formed is real and inverted with magnification factor = 3

Given:

An object is placed at a distance of 10 cm on the principal axis of a convex lens.

Focal length is less than 10 cm.

Image of it observed at a distance of 30 cm from the lens.

To find:

The nature of magnification of image.

Concept used:

Magnification factor = $\frac{Image \ distance}{Object \ distance}$

Explanation:

Focal length is less than 10 cm.

Hence the object is placed in between focus and center of curvature

The image formed is real and inverted.

Image distance = 30 cm.

Object distance =  10 cm.

And   Magnification factor = $\frac{Image \ distance}{Object \ distance}$

         Magnification factor = $\frac{30}{10}$

         Magnification factor = 3

Hence image formed is real and inverted with magnification factor = 3

To learn more...

1 Explain how a convex lens behaves as converging lens and as diverging lens​

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2 in an optical instrument a convex lens of focal length 20cm is used in combination with the concave lens of focal length 40 cm what is the power of this combination

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