| 1. | The human eye possesses the power of accommodation. this is the power to ? | |
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Focus on objects at different distances
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Decide which of the two objects is closer.
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Distinguish between lights of different colours
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Alter the diameter of the pupil as the intensity of light changes
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Report Question| 2. | When white light enters a prism, it gets split into its constituent colours. This is due to ? | |
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Scattering of light
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prism material have high density.
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different refractive index for different wavelength of each colour
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each colours has same velocity in the prism.
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| 3. | The muscular diaphragm that controls the size of the pupil is ? | |
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retina
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cornea
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iris
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ciliary muscles
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| 4. | choose the statement which is/ are incorrect ? | |
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The whole purpose of using a convex lens is to reduce the converging power of the eye-lens.
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Hypermetropia is that defect of vision due to which a person cannot see the nearby objects clearly.
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The near point of a hypermetropic eye is more than 25cm away.
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Hypermetropia is corrected by using spectacles containing convex lenses.
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| 5. | The term ” accommodation” as applied to the eye, refers to its ability to ? | |
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Vary the focal length of the lens
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Vary the distance between the lens and retina
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Erect the inverted image formed on the retina
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Control the light intensity falling on the retina
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| 6. | Which of the following colors is least scattered by fog, dust of smoke ? | |
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Yellow
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Red
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Blue
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Violet
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| 7. | The ability of eye lens to adjust its focal length to form a sharp image of the object at varying distances on the retina is called ? | |
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Power of enabling of the eye
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Power of accommodation of the eye
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Power of adjustment of the eye
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Power of observation of the eye
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| 8. | The black opening between the aqueous humour and the lens is called ? | |
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cornea
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pupil
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iris
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retina
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| 9. | The defect of vision in which the person is able to see distant object distinctly but cannot see nearby objects clearly is called ? | |
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Hypermetropia
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Far-sightedness
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Long-sightedness
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All above
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| 10. | A person cannot see the distant objects clearly (though he can see the nearby objects clearly). He is suffering from the defect of vision called ? | |
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Presbyopia
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Hypermetropia
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Cataract
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Myopia
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