When a biconvex lens of glass having a refractive index of 1.47 is dipped in a liquid, it acts as a plane sheet of glass. The liquid must have a refractive index:
1. equal to that of glass.
2. less than one.
3. greater than that of glass.
4. less than that of glass.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA ray of light is incident at an angle of incidence, i, on one face of a prism of angle A (assumed to be small) and emerges normally from the opposite face. If the refractive index of the prism is , the angle of incidence i, is nearly equal to
1. A
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA concave mirror of the focal length is placed at a distance of d from a convex lens of focal length . A beam of light coming from infinity and falling on this convex lens-concave mirror combination returns to infinity. The distance d must be equal to:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe magnifying power of a telescope is 9. When it is adjusted for parallel rays the distance between the objective and eyepiece is 20 cm. The focal length of the lenses is :
1. 10 cm, 10 cm
2. 15 cm, 5 cm
3. 18 cm, 2 cm
4. 11 cm, 9 cm
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology1. Virtual, upright, height = 0.5 cm
2. Real, inverted, height = 4 cm
3. Real, inverted, height = 1 cm
4. Virtual, upright, height = 1 cm
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology1. Difference between apparent and real depth of the pond
2. Mirage on hot summer days
3. Brilliance of the diamond
4. Working of optical fibre
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA ray of light travelling in a transparent medium of refractive index falls on a surface separating the medium from the air at an angle of incidence of 45 °. For which of the following value of , the ray can undergo total internal reflection?
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA lens having focal length f and aperture of diameter d forms an image of intensity I . An aperture of diameter in central region of lens is covered by a black paper. The focal length of lens and intensity of the image now will be respectively:
1. f and
2.
3. f and
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyTwo thin lenses of focal lengths f1 and f2 are in contact and coaxial. The power of the combination is :
1.
2.
3.
4. None of the above
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA boy is trying to start a fire by focusing sunlight on a piece of paper using an equiconvex lens of focal length 10 cm. The diameter of the sun is 1.39 x109 m and its mean distance from the earth is 1.5 x 1011 m. What is the diameter of the sun's image on the paper?
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology