Question

Write two precautions to be taken while tracing path of a ray of light passing through a rectangular glass slab for different angles of incidence.

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Abser answered this
4 helpful votes in Science, Class XII-Commerce

Precautions:
1.The glass slab should be properly place on white paper 
2.The pins should be fixed vertically and should maintain a gap of 5 cm from each other  3.Don't hammer the pins.
4.The feet of pins should be placed in straight line
5.The angle of incidence should lie between 30 and 60 degree.

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Answer 1

• We should use a drawing board made of soft wood
• the glass slab should be clean with no bubbles
• the pins must be placed perpendicular in straight line
• the angle of incident must be between 30 to 60 degree
• keep your eyes along the line while observing the path of light and fixing the pins vertically.