The retina of the eye is the:
ALight-sensitive screen
BFocusing element
CFront cover
DColoured iris
Answer & Solution
Correct answer: A. Light-sensitive screen
The human eye works similarly to a camera. Light enters through the cornea and lens, which act as the **focusing elements**. These elements focus the light onto the back surface of the eye called the **retina**.
1. **Function**: The retina contains millions of specialized cells called photoreceptors (rods and cones) that are sensitive to light.
2. **Conversion**: When light hits these cells, they convert light energy into electrical signals, which are sent to the brain via the optic nerve.
3. **Analogy**: Just as a movie is projected onto a screen to be seen, the lens of the eye projects an image onto the retina. Therefore, the retina acts as the **light-sensitive screen** of the eye.
Matching the options:
- **Focusing element**: Cornea and Lens
- **Front cover**: Cornea
- **Coloured iris**: Iris
- **Light-sensitive screen**: Retina
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