NCERT Solution: Light Reflection and Refraction
Magnification is 3 times and image distance v=80 cm
Since, object distance is taken as negative; as per sign convention so,
or, u = - 80 / 3 cm
Nature of image: Since image is formed on the other side of lens hence it is a real image and inverted image.
Nature of Lens: Enlarged image is formed by convex lens and not by concave lens, so it is a convex lens.
. The degree of divergence or convergence achieved by a given lens is called power of the lens. The unit of power of lens is diopter and is expressed by D. Focal length of lens used by first student is in positive hence it is a convex lens. The lens of second student is a concave lens.
Power of lens (first student) =+2
Power of lens (second student) =-2
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