Question

Under what circumstances will an image be located at the focal point of a lens or mirror?

Short answer

The image will be located at a focal point in the situation when$d_i=f$ .

Step-by-step solution

Define Geometric Optics

Geometrical optics, often known as ray optics, is an optics model that describes light propagation using rays. In geometric optics, a ray is an abstraction that can approximate the routes along which light propagates under particular conditions.

Explanation

When an object is placed at infinity, then the light of rays is parallel to the axis of the mirror, or the lens meets or appears to meet at a focal point of the mirror and the lens, which then forms an image.

Therefore, the image will be located at the focal point only if$d_i=f$ .