How to draw ray diagrams

1.	How to draw ray diagrams
Answer» There are many concepts—1. The the incident ray it should be always be parallel to the the principal axis mens should be straight.2.when incident day 4 on mirror it will reflect back and it will always pass through the focus.And the the secondary which we will pass through the the object it will we pass through the point which is next to the object if we placed the object beyond see it will pass through see if we put the object at see it will pass through if if put object if we will it will pass through f

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