The least distance of distinct vision for a young adult with normal vision is about
(a) 25 m (b) 2.5 cm (c) 25 cm(c) 2.5 m
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A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?
The light ray bends towards the normal. When a ray of light travels from an optically rarer medium to an optically denser medium, it gets bent towards the normal. Since...
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The least distance of distinct vision for a young adult with normal vision is about
(c) The least distance of distinct vision is the minimum distance of an object to see clear and distinct image. It is 25 cm for a young adult with normal...
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What is Cancer? How is a Cancer cell different from normal cell? How do normal cells attain Cancerous nature?
An abnormal and uncontrolled division of cells is termed as Cancer. The Cancerous cells are different from the normal cells in the following ways. Cancer Cells Normal Cells 1. Cancer cells divide in an uncontrolled...
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What was Birsa’s vision of a golden age? Why do you think such a vision appealed to the people of the region?
The tribal sirdars talked of a golden age. This was an age when the Mundas had been free from the oppression of dikus (enemies). They visualized of a time when...
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A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why
Light ray travelling in air and entering obliquely into water is bent towards the normal; because the speed of the ray decreases in water.
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What is the far point and near point of the human eye with normal vision
For normal vision, the near point is about 25 cm and far point is infinity. Thus, a normal eye can see objects clearly that are between 25 cm and infinity.
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A colour blind boy is born to a couple with a normal colour vision. Write the genotype of the parents.
Father - XY , Mother -XXC
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A person needs a lens of power – 2.5 dioptres for correcting his vision. Name the defect of vision he is suffering from.
He is suffering from myopia Concave lens should be used to correct this defect of vision. f = 1/P = 1/(–2.5)m = – 4m
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The muscles of a normal eye are least strained when the eye is focused on an object (a) far away from the eye
(a) far away from the eye
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How does the fringe width, in Young’s double-slit experiment, change when the distance of separation between the slits and screen is doubled?
The fringe width is β = λD/d If D (distance between slits and screen) is doubled, then fringe width will be doubled.
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