Question

Complete the following table by observing the given figures:

Hint:

Myopia is corrected using a concave lens, while hypermetropia is corrected using a convex lens. Both defects are due to improper focusing of light on the retina.

Answer 1

Step 1: Understanding eye defects
Human vision defects occur when light rays do not focus properly on the retina. Two common defects are:

• Myopia (Nearsightedness): The eye can see nearby objects clearly but distant objects appear blurred.
• Hypermetropia (Farsightedness): The eye can see distant objects clearly but nearby objects appear blurred.

Step 2: Explanation of the figures
Figure 1 - Myopia: - The image forms in front of the retina. - This happens due to the elongation of the eyeball or excessive curvature of the lens. - Corrected using a concave lens, which diverges light rays before they enter the eye, shifting the image onto the retina. Figure 2 - Hypermetropia: - The image forms behind the retina. - This occurs due to the shortening of the eyeball or insufficient curvature of the lens. - Corrected using a convex lens, which converges light rays before entering the eye, shifting the image onto the retina.
Step 3: Completing the table
\begin{table}[h] \centering \renewcommand{\arraystretch}{1.5}

\hline Points	Figure 1 (Myopia)	Figure 2 (Hypermetropia)
\hline (a) Name of the defect	Myopia (Nearsightedness)	Hypermetropia (Farsightedness)
\hline (b) Position of the image	In front of the retina	Behind the retina
\hline (c) Lens used to correct the defect	Concave lens	Convex lens
\hline

\end{table}