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Q.

Which of the following statements is INCORRECT?

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a

The distance measured on the left side of the mirror is always taken as negative.

b

The origin of the X-axis is regarded to be the pole of the mirror.

c

The object distance is always considered positive.

d

The height of an object measured above the primary axis is taken as positive.

answer is D.

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Detailed Solution

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All the statements are correct except the last statement.

Question Image
  • According to the sign conventions used for spherical mirrors, an object is always placed on the left side of the mirror.
  • As we can see in the diagram, the distance measured on the left side is taken as negative.
  • Therefore, the object distance must always be negative and not positive.
     
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