Question

when an illumenated object is held in front of a thick plane glass mirror ,several image are seen, out of which the second image is brightest . give reason​

Answer 1

This ray is now strongly reflected back by the silvered surface inside the glass. This ray is then partially refracted in air and this refracted ray forms another virtual image. This image is the brightest image because it is due to the light suffering a strong reflection at the silver surface.