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# To Find Image Distance for Varying Object Distances of a Convex Lens with Ray Diagrams - Physics Practical Class 10 Viva Questions with Answers

1. What is a lens?

Answer: A lens is a transmissive optical device mainly used to focus or disperse light beams through refraction.

1. How many lenses does a simple lens feature?

Answer: A simple lens consists of a single piece of transparent material.

1. How many lenses does a compound lens feature?

Answer: A compound lens consists of several simple lenses arranged along a common axis.

1. What are the types of lenses?

Answer: Two types of lenses are convex and concave lenses.

1. What is a convex lens?

Answer: A convex lens is a lens that is thick at the centre and thin at the edges.

1. Give the lens formula.

Answer: The lens formula is given by: 1/f= (1/v) – (1/u).

1. What is a convex lens also known as?

Answer. The convex lens is also known as a converging lens.

1. What is a concave lens?

Answer: A concave lens is a lens that diverges a beam of light travelling from the source to a virtual, diminished, and upright image.

1. What is a concave lens also known as?

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

1. What is an optical centre?

Answer: The point on the principal axis at the centre of the lens is called the optical centre.

1. What is the type of convex lens?

Answer: Three types of convex lens are:

• Double convex lens
• Plano-convex lens
• Concavo-convex lens
1. What is the formula to calculate the power of the lens?

Answer: The power of the lens is given by the formula: P=1/f.

1. How many focal lengths does a lens have?

Answer: A lens features two focal points each on either side.

1. What is the focal length?

Answer: The focal length is the distance between the optical centre and the focal point or focus of the lens.

1. Define the pole of the lens.

Answer: The centre of the spherical refracting surface of the lens is called the pole.