In the above question if there is air in the object space and water in the image space, then the focal length is In the above question if there is air in the object space and water in the image space then the focal length is November 17, 2020 Category: Cengage NEET by C.P Singh , Chapter 18 - Refraction at Spherical Surfaces , Part 2 , Facebook Messenger WhatsApp Share this:TwitterFacebook Related