A concave mirror has focal length 15cm. If an object is placed at a distance of 30 cm from the mirror, then image formed by the mirror lies at a distance (from the mirror)

Options

A. less than 15.0 cm
B. between 15.0 cm and 30,0 cm
C. 30 cm
D. beyond 30 cm

Answer

C

Explanation

we have,
f =-15 cm
u=-30 cm
From mirror formula,
`(1)/(f)= (1)/(v)+ (1)/(u)`
`(1)/(-15)= (1)/(v)+ (1)/(-30)`
`(1)/(v)= (1)/(30)- (1)/(15)= (-1)/(30)`
`implies v= -30 cm= 30 cm`