An object is placed on the principal axis of a concave mirror at a distance of 1.5f ( f is the focal length). The image will be at:
1. -3f
2. 1.5f
3. -1.5f
4. 3f
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIf the critical angle for total internal reflection from a medium to vacuum is , the velocity of light in the medium is:
1. \(1.5\times10^{8}\) m/s
2. \(\frac{3}{\sqrt{2}}\times10^{8}\) m/s
3. \(\sqrt{2}\times10^{8}\) m/s
4. \(3\times10^{8}\) m/s
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe power of a biconvex lens is 10 dioptre and the radius of curvature of each surface is 10 cm. The refractive index of the material of the lens is:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyFor the angle of minimum deviation of a prism to be equal to its refracting angle, the prism must be made of a material whose refractive index -
1. lies between 2 and
2. is less than 1
3. is greater than 2
4. lies between and 1
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA rod of length 10 cm lies along the principal axis of concave mirror of focal length 10 cm in such a way that its end closer to the pole is 20 cm away from the mirror. The length of the image is -
1. 15 cm
2. 2.5 cm
3. 5 cm
4. 10 cm
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA thin prism of angle 15º made of glass of refractive index = 1.5 is combined with another prism of glass of refractive index = 1.75. The combination of the prism produced dispersion without deviation. The angle of the second prism should be :
1. 5º
2. 7º
3. 10º
4. 12º
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA converging beam of rays is incident on a diverging lens. Having passed through the lens the rays intersect at a point 15 cm from the lens on the opposite side. If the lens is removed the point where the rays meet will move 5 cm closer to the lens. The focal length of the lens is :
1. 5 cm
2. -10 cm
3. 20 cm
4. -30 cm
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe speed of light in media M1 and M2 is 1.5 × 108 m/s and 2.0 × 108 m/s respectively. A ray of light enters from medium M1 to M2 at an incidence angle i. If the ray suffers total internal reflection, the value of i is -
1. Equal to or less than sin–1
2. Equal to or greater than sin–1
3. less than sin–1
4. Equal to sin–1
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA ray of light is incident on a 60º prism at the minimum deviation position. The angle of refraction at the first face (i.e. incident face) of the prism is:
1. 30º
2. 45º
3. 60º
4. zero
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA plane-convex lens of unknown material and unknown focal length is given. With the help of a spherometer, we can measure the,
1. | focal length of the lens. |
2. | radius of curvature of the curved surface. |
3. | aperture of the lens. |
4. | refractive index of the material. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology