Question
Question: A far sighted man who has lost his spectacles, reads a book by looking through a small hole (3-4 mm)...
A far sighted man who has lost his spectacles, reads a book by looking through a small hole (3-4 mm) in a sheet of paper. The reason will be
A
Because the hole produces an image of the letters at a longer distance
B
Because in doing so, the focal length of the eye lens is effectively increased
C
Because in doing so, the focal length of the eye lens is effectively decreased
D
None of these
Answer
Because in doing so, the focal length of the eye lens is effectively decreased
Explanation
Solution
Man is suffering from hypermetropia. The hole works like a convex lens.