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# To Find the Focal Length of a Concave Lens Using a Convex Lens - Physics Practical Class 12 Viva Questions with Answers

1. The lens works on which principle?

Answer: The lens works on the principles of refraction.

1. What is a concave lens?

Answer: The concave lens is the lens with at least one surface curved inside. This lens can diverge the light from the source.

1. What is a concave lens also known as?

Answer: The concave lens is known as a diverging lens.

1. What is meant by the power of the lens?

Answer: The power of a lens is defined as the reciprocal of the focal length.

1. Which lens is used to cure myopia?

Answer: Myopia is cured using a concave lens because it helps to rectify the refractive errors.

1. Does the refractive index affect the power of the lens?

Answer: Yes, the refractive index is one of the factors that affect the power of the lens.

1. Define convex lens.

Answer: The convex lens is thicker at the centre and thinner at the edges. It converges into a straight beam of light.

1. When a convex lens is combined with a concave lens, what would be the quality of the image?

Answer: A sharper image is formed when a convex lens is combined with a concave lens.

1. How is the lens power measured?

Answer: Lens power is measured in dioptres (D).

1. Which lens is used to treat hypermetropia or long-sightedness?

Answer: The convex lens is the lens used to treat hypermetropia or long-sightedness.

1. What is the formula for finding the focal length of the convex lens?

Answer: The formula to find the focal length of the convex lens is 1/f=1/u+1/v.

1. Which lens is used in the magnifier?

Answer: The convex lens is used in the magnifiers.

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