An object is placed in front of a convex mirror of radius of curvature 20 cm. Its image is formed 8 cm behind the mirror. The object distance is :
When an object is kept at a distance of 30 cm from a concave mirror, the real image is formed at a distance of 10 cm. If the object is moved with a speed of 9 m/s along principal axis, the speed with which image moves is :
A person looks into a shaving mirror. The size of image of his face is twice the actual size of his face. If the face is at a distance 20 cm then find the radius of curvature of the mirror :
An object of length 2.5 cm is placed at a distance of 1.5f from a concave mirror of focal length f. The length of the object is perpendicular to the principal axis. Find the length of image ?
A light ray traveling parallel to the principal axis of a concave mirror strikes the mirror at angle of incidence q. If radius of curvature of the mirror is R, then after reflection, the ray meets the principal axis at distance d from the centre of curvature, then d isΒ
A linear object is placed along the axis of a mirror as shown in fig. If βfβ is the focal length of the mirror then the length of image isΒ
A short linear object of length L lies on the axis of a spherical mirror of focal length Ζ at a distance u from the mirror. Its image has an axial length L’ equal to :