Question by say cheese!: A far sighted man who has lost his spectacles, speculated the radius of a plate by looking through a small….?
A far sighted man who has lost his spectacles, speculated the radius of a plate by looking through a small hole in a sheet of paper. The reason is :-
a) In doing so, equivalent focal length remains the same as with the spectacles.
b) In doing so, the focal length of the eye lens is effectively decreased.
c) the hole produces an image of the plate at a longer distance.
d) none of the above.
Please choose the correct option and give reason in support of your answer.
Best answer:
Answer by GalileoPi
d) none of the above.
A small hole works for the eye in a similar manner to the aperture on a camera lens.
The smaller apertures give greater depth of field where the subject matter is.
This translates to greater depth of focus where the film (eye retina) is.
So things “look” sharper.
Try holding a finger about 4 inches from your eye while viewing the computer screen.
Its edges look blurred while focusing on the screen.
Now squint, and it sharpens up.
Give your answer to this question below!
