1.

Read the following statements and choose the correct option. (A) Onlly a point source forms a complete umbra. (B) An extended source forms a complete umbra and penumbra.

Answer»

Only A is true
Only B is true
Both A and B are true
Both A and B are false

Solution :Only a POINT source of light FORMS a complete dark patch on a screen, i.e., umbra.
An extended source of light forms both umbra and penumbra.


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