Question

In the parallax method, what type of object is commonly used to determine the focal point of a lens or mirror?

Options

• A point source of light

• A candle flame

• A flat mirror

• A convex mirror

Answer 1

A point source of light

Explanation:

A point source of light is commonly used in the parallax method because it produces a sharp, well-defined image that makes it easy to detect parallax between the image and the reference pin. This ensures precise determination of the focal point of the optical device.