Question

A concave mirror has focal length of 25 cm. At what distance should the object from the mirror be placed so that if it forms an image at 20 cm distance from the mirror? Also find the magnification produced by the mirror.

Answer 1

Answer:

50cm2

Explanation:

For a concave mirror, the image distance becomes equal to the object distance, i.e., the image is formed at the object position when the object is placed on the centre of curvature for the concave mirror.

For a concave mirror, the image distance becomes equal to the object distance, i.e., the image is formed at the object position when the object is placed on the centre of curvature for the concave mirror.So, object distance= radius of curvature.

For a concave mirror, the image distance becomes equal to the object distance, i.e., the image is formed at the object position when the object is placed on the centre of curvature for the concave mirror.So, object distance= radius of curvature.We know that, for a spherical mirror, radius of curvature=2× focal length.

For a concave mirror, the image distance becomes equal to the object distance, i.e., the image is formed at the object position when the object is placed on the centre of curvature for the concave mirror.So, object distance= radius of curvature.We know that, for a spherical mirror, radius of curvature=2× focal length.Given, focal length=25cm

For a concave mirror, the image distance becomes equal to the object distance, i.e., the image is formed at the object position when the object is placed on the centre of curvature for the concave mirror.So, object distance= radius of curvature.We know that, for a spherical mirror, radius of curvature=2× focal length.Given, focal length=25cmTherefore, object distance= radius of curvature=2×25cm=50cm