Hypermetropia & Its Cure

Q. If R1 and R2 are the radii of curvature of the spherical surfaces of a thin lens and R1>R2, then this lense can correct 1)myopia 2)hypermetropia 3)presbiopia 4)astigmatism

Q.

A person cannot see distinctly at the distance less than one metre. Calculate the power of the lens that he should use to read a book at a distance of 25 cm

[CPMT 1977; MP PET 1985, 88; MP PMT 1990]

1. + 3.0 D

2. - 3.0 D

3. + 0.125 D

4. + 4.0 D

Q.

Lens used to remove long-sightedness (hypermetropia) is

1. Convex lens

2. Convexo-concave lens

3. Concave lens
4. Plano-concave lens

Q.

A person can see the objects lying between 25 cm and 10 m from his eye. His vision can be corrected by using lens of power:

1. + 10 D

2. - 0.1 D

3. + 4 D

4. - 0.25 D

Q. A person has a near point at $80\text{cm}$. Find the power of the lens he should use while reading at $25\text{cm}$.

1. $2.8\text{D}$
2. $3.8\text{D}$
3. $4.8\text{D}$
4. $5.8\text{D}$

Q. A professor reads a greeting card received on his ${50}^{th}$ birthday with $+2.5\text{D}$ glass keeping the card $25\text{cm}$ away. Ten years later, when he reads his farewell letter with the same glasses, he has to keep the letter $50\text{cm}$ away. The power of lens the professor should use now is

1. $3\text{D}$
2. $4\text{D}$
3. $4.5\text{D}$
4. $6\text{D}$

Q. A person can see maximum near distance of $100\text{cm}$. What will be the power of lens needed to read a letter at a distance $20\text{cm}$?

1. $2\text{D}$
2. $3\text{D}$
3. $4\text{D}$
4. $5\text{D}$

Q.

Lens used to remove long-sightedness (hypermetropia) is

1. Concave lens
2. Plano-concave lens

3. Convexo-concave lens

4. Convex lens

Q.

A person cannot see distinctly at the distance less than one metre. Calculate the power of the lens that he should use to read a book at a distance of 25 cm

[CPMT 1977; MP PET 1985, 88; MP PMT 1990]

1. + 3.0 D

2. + 0.125 D

3. - 3.0 D

4. + 4.0 D

Q. A lens of power $+2.0\text{D}$ is placed in contact with another lens of power $-1.0\text{D}$. The combination will behave like

1. a converging lens of focal length $100\text{cm}$.
   
2. a diverging lens of focal length $100\text{cm}$
3. a converging lens of focal length $50\text{cm}$.
4. a diverging lens of focal length $50\text{cm}$.

Q.

Lens used to remove long-sightedness (hypermetropia) is

1. Concave lens
2. Plano-concave lens

3. Convexo-concave lens

4. Convex lens

Q.

A person cannot see distinctly at the distance less than one metre. Calculate the power of the lens that he should use to read a book at a distance of 25 cm

[CPMT 1977; MP PET 1985, 88; MP PMT 1990]

1. + 3.0 D

2. + 0.125 D

3. - 3.0 D

4. + 4.0 D

Q. Which lens are used to correct myopia or short sightedness?

1. Convex lens
2. Concave lens
3. Bipolar lens
4. Cylindrical lens

Q.

A person cannot see distinctly at the distance less than one metre. Calculate the power of the lens that he should use to read a book at a distance of 25 cm

[CPMT 1977; MP PET 1985, 88; MP PMT 1990]

1. + 3.0 D

2. + 0.125 D

3. - 3.0 D

4. + 4.0 D