Physics, asked by sravani291, 1 year ago

A child is using spectacles with power - 2.5 d what is meant by the negative sign and 18 focal length

Answers

Answered by SubhasisGupta

negative sign indicates that the rays passing through the spectacle deviates away from the centre.
18 focal length > 18 cm is the least distance for a distinct vision for normal eye.

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