An object is placed 42cm in front of a concave mirror of focal length 21cm. Light from the concave mirror is reflected onto a small plane mirror 21cm in front of the concave mirror. Where is the final image.
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First we use thr mirror formula for concave mirror,
1u+1v=1f142+1v=121
So ,
v = 42 cm
So , the image distance is 42 cm to the left of the concave mirror.
Use mirror formula for the plane mirror, with f =∞u =21−42 = −21 cmSince the image produced by the concave mirror is the object for the plane mirror.So,1u+1v=1f1−21+1v=1∞So ,v= 21 cmHence , final image is 21 cm in front of the plane mirror.
1u+1v=1f142+1v=121
So ,
v = 42 cm
So , the image distance is 42 cm to the left of the concave mirror.
Use mirror formula for the plane mirror, with f =∞u =21−42 = −21 cmSince the image produced by the concave mirror is the object for the plane mirror.So,1u+1v=1f1−21+1v=1∞So ,v= 21 cmHence , final image is 21 cm in front of the plane mirror.
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