Class 10ScienceThe Human Eye and the Colourful WorldMix Examples - The Human Eye and the Colourful World
EasyHow can you identify the type of vision defect a person is suffering from by physically touching their spectacles?
(N/A) By touching the lenses of the spectacles,one can determine their shape.
$1$. If the lens is thinner in the middle and thicker at the edges,it is a concave lens,which is used to correct myopia (nearsightedness).
$2$. If the lens is thicker in the middle and thinner at the edges,it is a convex lens,which is used to correct hypermetropia (farsightedness).
$1$. If the lens is thinner in the middle and thicker at the edges,it is a concave lens,which is used to correct myopia (nearsightedness).
$2$. If the lens is thicker in the middle and thinner at the edges,it is a convex lens,which is used to correct hypermetropia (farsightedness).
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Similar Questions
Account for the following:
$(a)$ Part of the human eye that helps in changing the focal length of the eye lens.
$(b)$ The condition resulting due to the eye lens becoming cloudy.
$(c)$ The factors on which the colour of the scattered white light depends.
$(d)$ The range of vision of a normal eye.
$(e)$ The sky appears dark to the astronauts in space.
$(a)$ Part of the human eye that helps in changing the focal length of the eye lens.
$(b)$ The condition resulting due to the eye lens becoming cloudy.
$(c)$ The factors on which the colour of the scattered white light depends.
$(d)$ The range of vision of a normal eye.
$(e)$ The sky appears dark to the astronauts in space.
Medium
View SolutionHow will you use two identical prisms so that a narrow beam of white light incident on one prism emerges out of the second prism as white light? Draw the diagram.
Medium
View SolutionIn the figure,a ray of light $PQ$ is incident normally on one face $AB$ of an equilateral glass prism. What are the angles of incidence at faces $AB$ and $AC$?
Difficult
View SolutionWhat is the complementary color of blue?
Easy
View Solution$(a)$ State two main causes of a person developing near-sightedness (myopia). With the help of a ray diagram, suggest how this disability can be corrected.
$(b)$ The far point of a myopic person is $150 \ cm$ in front of the eye. Calculate the focal length and power of the lens required to enable him to see distant objects clearly.
$(b)$ The far point of a myopic person is $150 \ cm$ in front of the eye. Calculate the focal length and power of the lens required to enable him to see distant objects clearly.
Medium
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