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Q.

Is it true that a real and inverted image is formed when an object of size $1 cm$ is placed at a distance of $15 cm$ from a concave mirror of focal length $20 cm ?$

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a

True

b

False

answer is B.

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Detailed Solution

The above statement is false.
The object is held in the focal plane, close to the pole. We know that a concave mirror forms a virtual, erect and magnified image when the object is placed between the pole and its principal focus. Therefore, the image formed will be virtual. Here, the size of the image does not determine the nature of the image formed.
The correct statement would be that a virtual and erect image is formed when an object of size

1 cm

is placed at a distance of

15 cm

from a concave mirror of focal length

20 cm .

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Is it true that a real and inverted image is formed when an object of size 1 cm is placed at a distance of 15 cm from a concave mirror of focal length 20 cm?