Vision Quiz 1

Question 1

A corrective lens with a power of $$-4D$$ is prescribed to a person. Calculate the farthest point of clear vision this person can see with his or her naked eyes.

Accepted Answer

$$25\,cm$$

Answer

$$50\,cm$$

Answer

$$30\,cm$$

Answer

$$70\,cm$$

Question 2

The near point of a person's eye is $$1\,m$$. What would be the optimum focal length of corrective lenses prescribed to him by an eye specialist

Accepted Answer

$$5\,D$$

Answer

$$-5\,D$$

Answer

$$-2\,D$$

Answer

$$4\,D$$

Question 3

If a person who wears a lens of $$-2\,D$$ is suggested by his doctor to increase the power to $$-5\,D$$ then by how much percent has the far point decreased for his eye

Accepted Answer

$$60\%$$

Answer

$$30\%$$

Answer

$$20\%$$

Answer

$$45\%$$

Question 4

A person visited a doctor for his eye vision problem. Doctor advised him to use lens of power $$''P''$$ if his distend vision is $$100\,cm$$ then power $$''P''$$ must be

Accepted Answer

$$+1$$ Dioptre

Answer

$$-1$$ Dioptre

Answer

$$+2$$ Dioptre

Answer

$$-2$$ Dioptre

Question 5

An object is placed at a distance $$10\,m$$ in front of a boy. Now he placed a concave lens between his eye object. Now he sees object-

Accepted Answer

Cannot say anything

Answer

Near to him

Answer

Far from him

Answer

Nothing happen position of object appear to be same