Question

A convex lens has a focal length of 10 cm. At what distance from the lens should the object be placed so that it forms a real and inverted image 20 cm. away from the lens? What would be the size of the image formed if the object is 2 cm high? With the help of a ray, the diagram shows the formation of the image by the lens in this case?
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Answer 1

Explanation:

Hope it helps you. See the attached file.

Answer 2

Answer:

hii how are you?

Explanation:

Formula used:

1f=1v−1u

Complete answer:

From the given information we have the data as follows.

The focal length of the convex lens is, f=+10cm

The image distance is, v=+20cm

The height of the object, O=2cm

As the image distance is positive, thus, the image formed will be real and inverted.

Consider the formula that relates the focal length of the lens, image distance and object distance.

1f=1v−1u

Where f is the focal length, v is the image distance and u is the object distance.

Substitute the values in the above equation.

110=120−1u⇒1u=120−110∴1u=120