Question

While doing experiment with candle to find focal length of a concave mirror, the candle is
placed between​

Answer 1

Answer:

the candle is placed between the edge of the mirror

Answer 2

The candle is kept between infinity and radius of curvature of the mirror.

Explanation:

• Concave mirror is a spherical mirror whose outward surface is painted. Inner surface of the sphere aperture acts as the reflecting surface.
• Light incident on the mirror, gets converged on a point and image is formed.
• Object at a far off distance is considered to be at infinity.
• Rays from an object kept an infinity converges at the focus.
• Focus is a point on principal axis where rays parallel to principal axis and coming from infinity converge.
• Focal length of spherical mirror is half of the radius of curvature.
• Here, focal length is the distance of focus from pole.
• For concave mirror, object at infinity forms an image at focus which is diminished and real i.e. in front of mirror.

For finding the focus, object is kept beyond radius of curvature so that the image is formed on the focus and then the length is measured from the mirror to the image.