Question

1.Choose the incorrect statement?
Option
1.The height of the object is taken to be positive.
2.The height of the object should be taken as positive for both virtual and real image.
3.A negative sign in the value of the magnification indicates that the image is real.
4.A negative sign in the value of the magnification indicates that the image is virtual.​

Answer 1

Answer:

The height of the object should be taken as positive for both virtual and real image.

Explanation:

Concave lenses and convex mirrors always produce virtual and erect pictures, hence their magnification is always positive. For a convex lens or a concave mirror, it can be either negative or positive.

Only when a single optical device is utilised can positive magnification for virtual images and negative magnification for real images be true. A virtual and inverted image may be created by combining. An illustration of this is a compound microscope.

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Answer 2

Answer:

Option 4. A negative sign in the value of the magnification indicates that the image is virtual, is incorrect

Explanation:

The sign of height of the object is not affected by the nature of the image no matter what it is. Hence, the height of the object is positive, in any case.

• Object heights are considered positive. This is in Cartesian coordinates.
• The object is placed on the negative axis of the mirror and the image is created on the positive axis.
• Object height is considered positive because the object is aligned parallel to the y-axis.
• The sign convention for lenses and mirrors considers objects or images above the long axis to be positive.

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