A convex lens is placed in contact with a plane mirror. A point object at a distance of 20 cm on the axis of this combination has its image coinciding with itself. What is the focal length of the lens ?
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riyadel:
20 cm
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formula 1/f=1/v+1/u laga do ans ajaega
20cm nahi aa raha
ohhhh
koi nai ajaega
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