Question

An object 2.5 cm high is placed at a distance of 10cm from a concave mirror of radius of curvature 30cm. The size of image is -

• A. 5cm
• B. 10mm
• C. 10cm
• D. 7.5cm

Answer 1

Answer: (D)

7.5cm

Answer 2

f = $\frac { - 30 } { 2 }$ = –15 cm, u = –10 cm

m = =

$\frac { - 15 } { - 15 - ( - 10 ) }$ =

\ hI = 7.5 cm