The focal length of a concave mirror is and the focal length of a convex mirror is

PHYSICS · Subjective · AP · Physics 2: Algebra-based · Geometric Optics · Geometric Optics

Problem

The focal length of a concave mirror M1M_1 is −20 cm-20\,\text{cm} and the focal length of a convex mirror M2M_2 is +20 cm+20\,\text{cm}. A point object is placed at a distance xx in front of M1M_1 or M2M_2. Match the following columns.
Column IColumn II
(a) x=20 cmx=20\,\text{cm}, mirror is M1M_1(p) Image is at infinity
(b) x=20 cmx=20\,\text{cm}, mirror is M2M_2(q) Image is real
(c) x=30 cmx=30\,\text{cm}, mirror is M1M_1(r) Image is virtual
(d) x=30 cmx=30\,\text{cm}, mirror is M2M_2(s) Image is magnified

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