If refractive index of a prism is \(\mathrm{cot(A/2)}\), then the minimum angle of deviation is:
1. \(180^{\circ}-A\)
2. \(180^{\circ}-2A\)
3. \(90^{\circ}-A\)
4. \((A/2)\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe refractive index of the material of a prism is and its refracting angle is \(30^{\circ}\). One of the refracting surfaces of the prism is made a mirror inwards. A beam of monochromatic light entering the prism from the other face will retrace its path after reflection from the mirrored surface if its angle of incidence on the prism is:
1. | \(60^{\circ}\) | 2. | \(0^{\circ}\) |
3. | \(30^{\circ}\) | 4. | \(45^{\circ}\) |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology