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Is object distance always negative in both lens and mirrors?
Asked by nandanagnair | 17 Dec, 2023, 03:44: PM

In case of mirror , distances are measured from pole of the mirror .

Distance from pole to a point left of mirror is considered as negative distance .

Distance from pole to a point right of mirror is considered as positive distance .

Hence if object is left side of mirror , then the distance from mirror to object is negative.

If object is right side of mirror , then the distance from mirror to object is positive.

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In case of lens , distances are measured from optical centre of the lens .

Distance from optical centre to a point left of lens is considered as negative distance .

Distance from optical center to a point right of lens is considered as positive distance .

Hence if object is left side of lens , then the distance from lens to object is negative.

If object is right side of lens , then the distance from lens to object is positive.

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Answered by Thiyagarajan K | 17 Dec, 2023, 06:13: PM

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