Human Eye and C...

The eye defect represented by the figure is

The color of the sky is blue during the daytime, red during sunset, and black at night. This is due to

A student of class $$ 10, $$ is not able to see clearly the blackboard question when seated at a distance of $$ 5\  \mathrm{m} $$ from the board, the defect he is suffering from is

Long-sightedness or hypermetropia can be corrected by

The colored light that refracts most while passing through a prism is

A man can see the object up to a distance of one meter from his eyes. For correcting his eyesight so that he can see an object at infinity, he requires a lens whose power is 

A man can see the object between $$15\ cm$$ and $$30\ cm$$. He uses the lens to see the far objects. Then due to the lens used, the near point will be at 

A man suffering from myopia can read a book placed at $$10\ cm$$ distance. For reading the book at a distance of $$60\ cm$$ with relaxed vision, the focal length of the lens required will be:

The far point of a myopia eye is at $$40\ cm$$. For removing this defect, the power of lens required will be 

When white light passes through the achromatic combination of prisms, then what is observed