Two pieces of the same concave mirror, each with focal length 20 cm, have poles on the common x-axis at x=+5 cm and x=−5 cm. A fixed point object is at x=−30 cm. Both pieces face left. Find the separation between their real image coordinates in centimetres.
Physics · Geometrical optics · spherical mirror
JEE Mains NEET

Question

Two pieces of the same concave mirror, each with focal length 20 cm, have poles on the common x-axis at x=+5 cm and x=−5 cm. A fixed point object is at x=−30 cm. Both pieces face left. Find the separation between their real image coordinates in centimetres.

Physics · Geometrical optics · spherical mirror

G1 Physics · Accepted Answer

For pole +5, object distance=35 cm, v₁=20×35/15=46.667 cm to the right, image x₁=51.667. For pole −5, object distance=25 cm, v₂=100 cm, image x₂=95. Separation≈43.333 cm.