1. Describe myopia with neat label diagram.
2. Describe hypermetropia with neat labelled diagram.
3. Describe presbyopia.
4. A person with a myopic eye cannot see objects beyond 1.2 m distinctly.
What should be the type of the corrective lens used to restore proper
vision?
5. What is the far point and near point of the human eye with normal
vision?
6. A student has difficulty reading the blackboard while sitting in the last
row. What could be the defect the child is suffering from? How can it be
corrected?
7. Explain the steps involved in balancing a chemical equation.
8. Write the balanced equation for the following chemical reactions.
(i) Hydrogen + Chlorine → Hydrogen chloride
(ii) Barium chloride + Aluminium sulphate → Barium sulphate +
Aluminium chloride
(iii) Sodium + Water → Sodium hydroxide + Hydrogen
9. Write a balanced chemical equation with state symbols for the
following reactions.
(i) Solutions of barium chloride and sodium sulphate in water react
to give insoluble barium sulphate and the solution of sodium
chloride.
(ii) Sodium hydroxide solution (in water) reacts with hydrochloric
acid solution (in water) to produce sodium chloride solution and
Answers
Answer:
hi
Explanation:
id - 277 200 8756
pss- 1234
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1. The image of a distant point is formed in front of the Retina of defective eye. This the image of the object lying at infinity cannot be seen clearly by the myopic eye. The far point of such an eye is near to the eye This defect can be corrected by using a concave lens of suitable focal length.
2. Hypermetropia, sometimes called hyperopia, is the term used to define being longsighted. If you are hypermetropic, the image of a nearby object is formed behind the retina. This means that light is focused too far back in the eye, causing things which are close up to appear blurred.
3. Presbyopia is the gradual loss of your eyes' ability to focus on nearby objects. It's a natural, often annoying part of aging. Presbyopia usually becomes noticeable in your early to mid-40s and continues to worsen until around age 65.
4. In the defect of vision called as myopia the eyeball increases in size. So, the person with a myopic eye which cannot see distant objects beyond 1.2 metre distinctly has an eyeball which is elongated in size. myopia can be corrected with the help of concave lens of appropriate focal length.
A person with a myopic eye can use concave lens to restore proper vision.
5. The far point is the limit to the eye's accommodation range. The near point of the eye is the minimum distance of the object from the eye, which can be seen distinctly without strain. For a normal human eye, this distance is 25 cm.
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