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Dispersion of Light by a prism

The near poin...

Question

The near point of a normal eye is 25 cm and the far point is infinity.

A

True

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B

False

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Solution

The correct option is A True

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Q. For a normal eye, the far point is at infinity and the near point ofdistinct vision is about 25cm in front of the eye. The cornea of theeye provides a converging power of about 40 dioptres, and the leastconverging power of the eye-lens behind the cornea is about 20 dioptres. From this rough data estimate the range of accommodation(i.e., the range of converging power of the eye-lens) of a normal eye.

What is the far point and near point of the human eye with normal vision?

Q. 188 For a normal eye the far point is at infinity & near point is 25 cm the cornea of eye provides converging power of 40 diopter & least converging power of eye lens is about 20 dioptres . The range of accommodation (i.e. range of converging power of eye lens ) (in dioptre)is

Q. Calculate the power of the eye - lens of the normal eye when it is focused at its (a) far point, infinity and (b) near point, 25 cm from the eye. Assume the distance of the retina from the eye - lens to be 2.5 cm.

Q. The sky appear to be dome shaped and not flat because
a)the far point of the eye is at infinity
b)the far point of the eye is not at infinity but at a finite distance
c)the near point is at 25 cm
d)the near point ois not at 25 cm

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