At what distance from a concave mirror of focal length 25 cm should an object be placed so that the size of image is equal to size of the object.

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Solution

The size of the image is equal to the size of the object if the object is placed at the centre of curvature of a concave mirror.

Hence, the object should be placed at 50 cm.

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Q. At what distance from a concave mirror of focal length 25 cm should an object be placed so that the size of the image is equal to the size of the object.

At what distance from a concave mirror of focal length 25 cm should an object be placed so that the size of the image is equal to the size of the object?

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is placed at

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15 c m

. At what distance from the mirror should a screen be placed, so that we can get a sharp and clear image? Find nature and size (height) of the image.

Q. An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed so that a sharp focussed image can be obtained? Find the size and nature of image.

Solve:

(1) An object of size 7 cm is placed at 25 cm in front of concave mirror of focal length 15 cm. At what distance from the mirror should a screen be placed, so that we can get a sharp and clear image. Find nature and size of the image.

(2) An object of height 5 cm is held 20 cm away from converging lens of focal length 10 cm. Find the position, nature and size of the image formed.

(3) An object is placed at a distance of 10 cm from a convex lens of focal length 12 cm. Find the position and nature of the image.

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At what distance from a concave mirror of focal length 25 cm should an object be placed so that the size of image is equal to size of the object.

The size of the image is equal to the size of the object if the object is placed at the centre of curvature of a concave mirror. Hence, the object should be placed at 50 cm.

The size of the image is equal to the size of the object if the object is placed at the centre of curvature of a concave mirror.

Hence, the object should be placed at 50 cm.