No. If the speed of light were the same in all materials,
then a lens would NOT cause light rays to bend.
Also, here are a few additional tid-bits to consider
if the speed of light were the same in all materials:
-- The straw would not look 'broken' where it enters the water in the glass.
-- Cameras could not work.
-- Microscopes could not work.
-- Telescopes could not work.
-- A magnifying glass could not work.
-- Your EYES could not work.
-- Radio waves could not bend to follow the curve of the Earth.
-- A prism could not spread white light into its constituent colors.
-- Rainbows would not work.
