In case of a concave mirror magnification is found to be `m_(1) = -0.5` for a certain position of object and when object is displaced by 5 cm from this position then magnification is found to be `m_(2) = -0.25`. What will be the focal length of the mirror?

When an object is placed at 75 cm in front of a concave mirror, the magnification produced by the mirror is ( - 0.5). Find the focal length of the mirror.

A concave mirror forms an image of an object, magnified 4 times. When the object is moved through 5 cm along the axis of the mirror, the magnification of the image is 5. What is the focal length of the mirror?

For an object placed at a distance 20 cm from a concave mirror, the image is formed at the same position. What is the focal length of the mirror?

An object is kept at a distance of 0.3 m from a concave mirror. If magnification is (1)/(2) , then determine the focal length of the concave mirror.

When an object is placed at a distance of 25 cm from a mirror, the magnification is m_(1) . The object is moved 15cm farther away with respect to the earlier position, and the magnification becomes m_(2) . If m_(1)//m_(2)=4 , then calculate the focal length of the mirror.

When an object is placed at a distance of 25 cm from a mirror, the magnification is m_(1) . The object is moved 15cm farther away with respect to the earlier position, and the magnification becomes m_(2) . If m_(1)//m_(2)=4 , then calculate the focal length of the mirror.

When an object is placed at a distance of 25 cm from a mirror, the magnification is m_(1) . The object is moved 15cm farther away with respect to the earlier position, and the magnification becomes m_(2) . If m_(1)//m_(2)=4 , then calculate the focal length of the mirror.