Question

a convex lens of focal length 20cm can produce a magnified virtual as well as real image is this a correct statement if yes where should the object be placed in each case of for obtaining this images​

Answer 1

Yes a convex mirror of focal length 20 cm can produce:

• Magnified , virtual and erect image

• Real image

Position of the object in such cases:

1st case:

• In order to get a virtual , magnified , erect image ; the object has to be placed on the Principle Axis at a distance lesser that the focal length of the lens.

• This means that the object has to be placed between focus and optical centre of lens.

• In that case : u < f

2nd case:

• Apart from the first case , in all positions , a convex lens produces real and inverted images.

Refer to the attached diagram.

Answer 2

Answer:

Yes a convex mirror of focal length 20 cm can produce:

Magnified , virtual and erect image

Real image

Position of the object in such cases:

1st case:

In order to get a virtual , magnified , erect image ; the object has to be placed on the Principle Axis at a distance lesser that the focal length of the lens.

This means that the object has to be placed between focus and optical centre of lens.

In that case : u < f

2nd case:

Apart from the first case , in all positions , a convex lens produces real and inverted images.

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