Light of wavelength 5000 Å falls on a plane reflecting surface. For what angle of incidence is the reflected ray normal to the incident ray?
1. 37º
2. 45º
3. 90º
4. 0º
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA concave mirror of focal length f produces an image n times the size of the object. If the image is real, then the distance of the object from the mirror is:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA 4.5 cm needle is placed 12 cm away from a convex mirror of focal length 15 cm. What is the magnification?
1. 0.5
2. 0.56
3. 0.45
4. 0.15
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA man with hypermetropia cannot see objects closer than a distance of 40 cm from the eye. The power of the lens required so that he can see objects at 25 cm from the eye is:
1. +4.5 D
2. +4.0 D
3. 1.5 D
4. +3.0 D
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyFor a light incident from air on a slab of refractive index 2, the maximum possible angle of refraction is:
1. 30o
2. 45o
3. 60o
4. 90o
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA concave mirror gives an image three times as large as the object placed at a distance of 20 cm from it. For the image to be real, the focal length should be:
1. 10 cm
2. 15 cm
3. 20 cm
4. 30 cm
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA plane mirror is placed horizontally inside water . A ray falls normally on it. Then the mirror is rotated through an angle . The minimum value of for which the ray does not come out of the water surface is:
1.
2.
3.
4. 2
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn an astronomical telescope, the focal length of the objective lens is 100 cm and of the eyepiece is 2 cm. The magnifying power of the telescope for the normal eye is:
1. 50
2. 10
3. 100
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 lengths of lenses are:
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 & 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 & Biology