Question

QUICK. An actual light bulb is shown below, with a concave mirror. The blue dot is the focal point of the mirror. What best describes the unseen image of this bulb? Light bulb and concave mirror A. Real, upside-down, and larger than the actual bulb. B. Real, upside-down, and smaller than the actual bulb. C. Virtual, right-side-up, and larger than the actual bulb. D. There is no image at all in this case.

Answer 1

A. Real, upside-down, and larger than the actual bulb

Step-by-step explanation:

Since the mirror is a concave mirror with focal length at the blue dot, the bulb O (Object) must have been positioned between the focal point (F) and the centre of curvature C.

Check the formation of the image of the light bulb from the diagram attached.

When constructing the ray diagram, the following steps are followed.

1) An incident ray (i1) from the bulb striking the surface of the mirror and perpendicular to the principal axis converges at the focal point after reflection (ri)

2) The second incident (i2) ray passes through the centre of curvature C of the mirror undeflected and reflects back (r2) on the same line of incidence.

The two reflected ray intersects at a point P where the final image formed is placed.

Based on the ray diagram, the nature of the image I formed by the bulb can be seen to be Real, Larger than the bulb and Inverted (Upside) down)

The image is real because it is formed on the same side as the object(the bulb).