When the light diverges from a point source, the shape of the wavefront is:
1. Parabolic.
2. Plane.
3. Spherical.
4. Elliptical.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhen the light is coming from a distant star that is intercepted by the earth, the shape of the wavefront is:
1. | Spherical. | 2. | Plane. |
3. | Elliptical. | 4. | None of these. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe refractive index of glass is \(1.5\). What is the speed of light in glass?
1. \(2 \times 10^{8}~\text{m/s}\)
2. \(3 \times 10^{8} ~\text{m/s}\)
3. \(1.5 \times 10^{8} ~\text{m/s}\)
4. \(2.2 \times 10^{8}~\text{m/s}\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following is not true?
1. | The speed of light is dependent on the colour of the light. |
2. | The speed of violet light is less than the speed of the red light in glass. |
3. | The frequency of light never depends upon the property of the medium. |
4. | When the light diverges from a point source, the shape of the wavefront is plane. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe 6563 Å line emitted by hydrogen in a star is found to be red-shifted by 15 Å. The speed with which the star is receding from the Earth is:
1.\(6.87 \times 10^{5} m/s\)
2.\(4.75 \times 10^{4} m/s\)
3.\(3.20 \times 10^{5} m/s\)
4.\(5.45 \times 10^{4} m/s\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology