1. Does squinting help you see things more clearly? Explain. 2. Why, when there

Question

1. Does squinting help you see things more clearly? Explain.

2. Why, when there are very low-light conditions, are you unable to see color?

3. Stand in a well lit room facing a mirror. Close your eyes for 30-60 seconds. Open your eyes and focus on your pupil. What happens immediately after you open your eyes?

4. On a ray diagram, how can you tell if an image is in focus? When you are looking at the image itself, how can you determine if it is in focus?

5. What is the blind spot in your eye caused by?

Explanation / Answer

1. The light from the surroundings compete with the light needed to look at the desired object and hence when you squint your eyes the light from the surroundings gets dimmed and you can focus on the object clearly.

2. There are two light sensitive organs at the back of our eyes. Rods and cones. The rods operate at night and cones in proper night. The rods can't detect color but cones do.

3. The pupil expands in dim light so when you close your eyes, your pupils expand. As soon as you open your eyes, light falls on your eyes and the pupils contract.

4. If there is a sharp image formation, then the image is in focus.

5. The natural blind spot is formed by lack of receptors that's the rod and cones because the optic nerves and the blood vessels leave the eye there.

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