Solve this:
Q.22. Read the following statements and choose the correct option.
(A) Only a point source forms a complete umbra.
(B) An extended source of light forms both umbra and penumbra.
(a) Only A is true
(b) Only B is true
(c) Both A and B are true
(d) Both A and B are false

Dear student,A complete umbra is only formed by a point source only as it is only point source which forms a complete dark patch on screen.Also both umbra and penumbra can be formed by an extended source of lightSo both the statements written are correct.Rigth option is (c).Regards

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