Question

write 3 sign conventions used for refraction through lenses.
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Answer 1

Answer:

The sign conventions that are followed in case of refraction of light through spherical lenses are as follows:  

1. All the distances are measured from the optical centre of the lens.  

2. All the distances which are measured in the same direction of the incident light ray will be taken as positive.  

3. All the distance which are measured against the direction of incident light are taken as negative.  

4. The perpendicular distances to principal axis in upward direction will be positive and those in downward direction will be taken as negative.

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Answer 2

Answer:

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