Question

An object is placed at a distance of 20cm before a concave mirror. A real image is
obtained at a distance of 40cm from the mirror. The radius of curvature of mirror is
a) 32.6cm b)-13.3cm c)-28.6cm d)-26.6cm​

Answer 1

Answer:

0.266 m = d) 26.6 cm

Step-by-step explanation:

1/distance of object from mirror + 1/distance of image from mirror = 2/r

(The measurements must be in meter)

1/0.2 + 1/0.4 = 2/radius of curvature

              7.5 = 2/r

                  r = 2/7.5

                    = 0.266 meters

                    = 26.6 cm

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