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

1. What is a convex mirror?

Answer: A convex mirror is defined as a spherical mirror that features an outwardly bulged reflecting surface.

1. What is a convex lens?

Answer: A convex lens is a type of lens that is thicker at the centre and thinner at the edges. It converges on a straight beam of light.

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. Explain the type of image formed by the convex mirror.

Answer: A convex mirror always creates only virtual images that are erect and diminished for all object positions.

1. What kind of image is created by the convex lens?

Answer: The convex lenses form real as well as inverted images of different sizes. Erect, virtual, and enlarged images are formed based on the object’s position.

1. Is the focal length of a convex lens positive or negative?

Answer: A convex lens has a positive focal length.

1. What is a convex lens referred to as?

Answer: A convex lens is also referred to as a converging lens.

1. Which type of lens has a negative focal length?

Answer: The concave lens is the lens which has a negative focal length.

1. Define the power of the lens.

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

1. How is the lens power measured?

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

1. A convex lens is used to treat which type of refractive error in the human eye?

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

1. Why is a convex lens used in cameras?

Answer: A convex lens is used in cameras because it focuses light in order to create a clear and sharp image.

1. What are the types of mirrors?

• Plane mirrors
• Spherical mirrors
1. Define focal length.

Answer: Focal length is the distance between the optical centre and the principal focus of the lens.

1. Is a convex mirror a transparent or opaque object?

Answer: A convex mirror is an opaque object.

1. What happens to the incident ray, which is an incident on a convex lens?

Answer: A convex lens converges the incident rays towards the principal axis.

1. Which lens is known as a diverging lens?

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

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

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

1. The lens works on which principle?

Answer: The lens works on the principles of refraction.

1. Which type of lens is used in the human eye?

Answer: Convex lenses are the lenses used in the human eye.

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