Question

What is mean by hypermetropia and myopia eye and the diagram to correct it

Answer 1

Answer:

Both Myopia (short-sightedness) and Hypermetropia (long-sightedness) are common eye conditions that are occur when light does not focus on the retina of the eye. Both conditions are easily corrected using prescription glasses or contact lenses or in mild cases by laser eye surgery.

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Answer 2

Answer:-

$\red{\bigstar}$ Rakesh's Present age

$\large\leadsto\boxed{\sf{20 \: years}}$

$\red{\bigstar}$ Rakesh's Father's Present age

$\large\leadsto\boxed{\sf{40 \: years}}$

• Given:-

Rakesh is half his father's age

10 years ago, he was 20 years younger to his father.

• To Find:-

Present ages of Rakesh and his father = ?

• Solution:-

Let the age of Rakesh be = x

Let the age of Rakesh's father be = y

• ATQ:-

→ $\sf{x = \dfrac{1}{2}y}\: \: \: \: \: \: \longrightarrow[eqn.1]$

Also,

→$\sf{x - 10 = y - 10 - 20}$

→$\sf{x - 10= y -30}$

→$\sf{x - y = -30 + 10}$

→$\sf{x - y = -20}\: \: \: \: \: \: \longrightarrow[eqn.2]$

• Substituting the value of x in [eqn.2]:-

→ $\sf{\dfrac{1}{2}y - y = -20}$

→ $\sf{\dfrac{y-2y}{2} = - 20}$

→ $\sf{\dfrac{-y}{2} = - 20}$

→ $\sf{-y = -20 \times 2}$

→ $\sf{-y = -40}$

→$\large\boxed{\sf{y= 40}}$

• Substituting the value of y in eqn.1:-

→$\sf{x = \dfrac{1}{2} \times 40}$

→$\large\boxed{\sf{x = 20}}$

Therefore,

• Rakesh's Present age =

$\large\boxed{\sf{20 \: years}}$

• Rakesh's Father's Present age =

$\large\boxed{\sf{40 \: years}}$