The correct answer is (d) 25 cm.
The minimum distance of clear vision for a normal healthy eye of human being is 25 cm. This is the distance at which the eye can focus on an object without having to strain. Objects that are closer than 25 cm will appear blurry, while objects that are further away will appear too small.
The reason why the minimum distance of clear vision is 25 cm is because of the way the eye works. The eye has a lens that focuses light onto the retina. The retina is a light-sensitive tissue at the back of the eye. When light hits the retina, it creates an image that is sent to the brain. The brain interprets this image and creates a visual representation of the world around us.
The lens of the eye is able to change shape to focus on objects at different distances. When an object is close to the eye, the lens needs to be more curved in order to focus the light onto the retina. When an object is far away, the lens needs to be less curved.
The minimum distance of clear vision is the distance at which the lens of the eye can focus without having to strain. If an object is closer than 25 cm, the lens needs to be too curved and this can cause strain. If an object is further away than 25 cm, the lens needs to be too flat and this can also cause strain.
The minimum distance of clear vision is not the same for everyone. It can vary depending on the individual’s eye structure and health. Some people may have a minimum distance of clear vision that is closer than 25 cm, while others may have a minimum distance of clear vision that is further away.
If you are concerned about your vision, it is important to see an eye doctor. They will be able to assess your vision and determine if you have any problems.