Kerala 10th Physics Chapter 2 Lenses Short notes

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Below is a comprehensive list of short-answer type questions, including application-level questions, based on Chapter 2: Lenses from the Kerala 10th Standard Physics curriculum. Each question is designed to test key concepts, definitions, and problem-solving skills, with detailed answers for clarity.

Name three applications of lenses in daily life.
Answer: Spectacles, cameras, and telescopes.

What is the principal focus of a convex lens?
Answer: The principal focus of a convex lens is the point on the optic axis where light rays parallel to  the axis converge after refraction. It is real.

Why is the principal focus of a concave lens considered virtual?
Answer: The principal focus of a concave lens is virtual because parallel rays diverge after refraction and appear to originate from a point on the same side of the lens.

What happens to the image when an object is placed between the focus and the optic centre  of a convex lens?
Answer: The image is formed on the same side as the object, is magnified, erect, and virtual.

State one rule for drawing a ray diagram for a convex lens.
Answer: A ray parallel to the optic axis passes through the principal focus on the opposite side after
refraction. 

10th Physics Chapter 2 Lenses Short notes


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