A concave mirror has focal length 15 cm. Where should an object be placed in front of the mirror so that the image formed is three times the size of the object? A concave mirror has focal length 15 cm. Where should an object be placed in front of the mirror so that the image formed is three times the size of the object? October 29, 2020 Category: Cengage NEET by C.P Singh , Chapter 16 - Reflection of Light , Part 2 , Facebook Messenger WhatsApp Share this:TwitterFacebook Related