Why do you take time to find object when you enter in dim lighted room from outside in the sun?

When you move from a well-lit environment (like outside in the sun) to a dimly lit room, your eyes need time to adjust. This is due to a process called "dark adaptation."

Here are the steps of this process:

1. Light Exposure: When you're outside in the sun, your eyes are exposed to a lot of light. The cells in your eyes that detect light (called photoreceptor cells) are fully stimulated.

2. Entering a Dim Room: When you enter a dimly lit room, the amount of light that your eyes receive decreases dramatically. However, your photoreceptor cells are still in their "light-adapted" state and are less sensitive to light.

3. Dark Adaptation Begins: Your eyes begin to adapt to the dark. The photoreceptor cells start to regenerate a pigment called rhodopsin (also known as visual purple), which increases their sensitivity to light.

4. Rhodopsin Regeneration: The regeneration of rhodopsin takes some time. During this period, your eyes are gradually becoming more sensitive to the lower light levels in the room.

5. Full Dark Adaptation: After about 20 to 30 minutes, your eyes have fully adapted to the dark. You can now see objects in the room more clearly.

So, the reason it takes time to find objects when you enter a dimly lit room from outside in the sun is because your eyes need time to regenerate rhodopsin and increase their sensitivity to light. This is a normal and necessary process that allows us to see in a wide range of light conditions.