Question

. A real image th • A real image th the size of the object is 5 formed at a distance of 18 cm from a lens. From the table select the row containing the correct identification of lens and focal length of the lens. Type of lens Focal length (a) Concave - 15 cm (b) Concave - 90 cm (C) Convex + 30 cm (d) Convex + 15 cm
Please explain and tell why v is positive​

Answer 1

f=−15cm

Since focal length is negative, therefore it is a concave mirror

a)concave 15- cm

if it helps

please mark me as brainlist a humble request