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# Concave Lens Questions

Transparent glass, which disperses or concentrates light rays when passed through them by refraction, is known as a lens. The two types of lenses are the concave lenses and the convex lenses.

A concave lens is used to treat nearsightedness or myopia. Concave lenses have at least one surface curved inside. A concave lens is also known as a diverging lens.

Important Concave Lens Questions with Answers

1. Choose the right answer: myopia is also known as _____.

1. Farsightedness
2. Nearsightedness

Explanation: Nearsightedness or shortsightedness is also called myopia.

2. Concave lens ______.

1. Diverges the straight beam of light
2. Converges the straight beam of light

Answer: a) Diverges the straight beam of light

Explanation: Concave lens is also referred to as a diverging lens. This lens diverges a straight beam of light.

3. The point on the principal axis at the centre of the lens is known as ______.

1. Pole
2. Focus
3. Optical centre
4. Power

Explanation: Optical centre is the point on the principal axis located at the centre of the lens.

4. Concave lenses in indoor viewers are used to ______ the image.

1. Maximise
2. Minimise

Explanation: Concave lenses in indoor viewers or peepholes are used to minimise the image.

5. A concave lens is commonly used in _____.

1. Telescopes
2. Microscopes
3. Camera
4. Flashlights

Explanation: The telescope features a concave lens.

6. Write the lens formula.

Lens formula is given 1/f=1/u+1/v.

7. Which lens is thicker at the centre and thinner at the edges?

1. Plane lens
2. Mirror
3. Concave lens
4. Convex lens

Explanation: Concave lens is thicker at the centre and thinner at the edges.

8. Symptoms of myopia are ______.

1. Squinting
2. Frowning
4. All of the above

Answer: d) All of the above

Explanation: Myopia is associated with headaches, squinting, and frowning.

9. Which lens is known as the converging lens?

1. Concave lens
2. Convex lens

Explanation: Convex lens has the ability to converge the beam of light; hence it is known as the converging lens.

10. Which type of lens is used in the Magnifying glass?

1. Concave lens
2. Convex lens