Question

The focal length of a concave mirror is 16cm . Where should a point object is placed on its principal axis , so that a real and inverted image of same size as object is obtained

a) 16cm
b) 32cm
c) 48cm
d) 64cm ​

Answer 1

Answer:

b) 32 CM

Explanation:

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Answer 2

Answer:

At 32 cm should a point object is placed on its principal axis so that a real and inverted image of the same size as the object is obtained

Explanation:

• When the focal length is 16 cm and the point object is placed on the principal axis.
• So if the object, in this case, is placed and the subject is at a distance that is twice the lens's focal length.
• In this case, the focal length is 16cm and twice the focal length is  32 cm.

Option not chosen:

a) 16cm

The focal length and the point for obtaining real and inverted images of the same size as object cannot be at 16 cm as it will not give the desired result.

c) 48cm

For genuine and inverted pictures of the same size as the item, the focal length and point cannot be at 48 cm since this would not provide the intended results the image formed would be far away.

d) 64cm ​

The distance is 4 times the focal length when we only require two times so it will not give the desired result.

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