Question

list the precautions to be followed when we are doing the experiment using a rectangular glass slab

Answer 1

Precautions are :- 1. we should take drawing board , which is made of soft wood.2. Make sure Glass of slab is clean and free from air bubbles .3. The pin should be fixed on vertical position and all pins should be placed in straight line.4. Angle of incidence should be lies between 30° to 60° .5. Keep your eyes along line while absorbing the image , fixing the pins on the board.
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Answer 2

here is your answer....