Question

Define myopia hyper metropia presbyiopia and astigmatism
Find the value of sin^(-1)(sin3π/5)

Answer 1

Answer:

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Myopia (near-sighted): Difficulty viewing distant objects. Hyperopia (far-sighted): Difficulty viewing near objects, such as newspaper print. ... Astigmatism: While myopia and hyperopia result from eyes that are too long or short, astigmatism results from an uneven cornea surface, which results in distorted images.

Answer 2

Q 1. Define myopia, hyper metropia, presbyiopia and astigmatism?

Ans. There are 3 types of Eye Defects;

• Myopia

• Hyperopia

• Astigmatism.

And, There is one more:

   4. Presbyopia.

Explanation:

• Myopia : It is also called Nearsightedness, it occurs when the Eyeball is too long than needed to the focusing power of cornea and length of eye.

• Hyperopia : It is also called Farsightedness, It occurs when light rays entering the eye focus behind the retina, rather than directly on it. The eyeball of a farsighted person is shorter than normal . Farsightedness can be corrected with glasses to change the way light rays bend into the eyes. If your glasses begins with plus numbers, like +1.50, you are farsighted.

• Astigmatism : Astigmatism usually causes vision to be blurred or distorted to some degree at all distances. Symptoms of uncorrected astigmatism are eye strain and headaches, especially after reading or other prolonged visual tasks . Astigmatism is usually combined with Myopia or Hyperopia.

• Presbyopia : Presbyopia usually occurs beginning at around age 40, when people experience blurred near vision when reading, sewing or working at the computer. Everyone becomes presbyopic.

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Q 2. Find the value of sin^(-1)(sin3π/5)?

Ans.We know that, Sin⁻¹(sin x) = x

∵, Sin⁻¹(sin 3π/5) = 3π/5

∵, Sin⁻¹(sin 3π/5) = Sin⁻¹(sin 2π/5) = 2π/5