A luminescent object is placed at a depth d in a optically denser medium of refractive index Prove - Physics - Ray Optics And Optical Instruments

Question

A luminescent object is placed at a depth d in a optically denser
medium of refractive index Prove that radius r,of base of cone of
light , from the object that can emerge out from the surface,
r=d/√(r^2-1)

Nikita · Answer

Please find this answer
<img src=
"https://s3mn%20mnimgs%20com/img/shared/content_ck_images/ana_qa_image_58c5458c8478b%20jpeg">

A luminescent object is placed at a depth d in a optically denser medium of refractive index . Prove that radius r,of base of cone of light , from the object that can emerge out from the surface, r=d/√(r^2-1)