Class 10ScienceThe Human Eye and the Colourful WorldMix Examples - The Human Eye and the Colourful World
EasyWhat is astigmatism?
- A$A$ defect where the eye cannot focus on near objects.
- B$A$ defect where the eye cannot focus on distant objects.
- C$A$ defect in which the cornea or lens has an irregular curvature,causing blurred vision in all directions.
- D$A$ defect caused by the hardening of the ciliary muscles.
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Similar Questions
$A$ person needs a lens of power $-2.5 \ D$ for correcting his vision. Name the defect of vision he is suffering from. Which lens will he be using for the correction? Also,find the focal length of the lens.
Medium
View SolutionWhat is meant by the near point of the eye?
Easy
View SolutionWhen red and green light overlap,what color does that region appear?
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View SolutionWhat is the least distance of distinct vision for a normal adult with normal vision?
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View Solution$A$ $14$ year old student is not able to see clearly the questions written on the blackboard placed at a distance of $5\, m$ from him.
$(a)$ Name the defect of vision he is suffering from.
$(b)$ With the help of labelled ray diagrams show how this defect can be corrected.
$(c)$ Name the type of lens used to correct this defect.
$(a)$ Name the defect of vision he is suffering from.
$(b)$ With the help of labelled ray diagrams show how this defect can be corrected.
$(c)$ Name the type of lens used to correct this defect.
Medium
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