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Sahay Sir > Question Answers > NCERT Exemplar Class 12 > Physics > Chapter 9 - Ray Optics and Optical Instruments > At what angle should a ray of light be incident on the face of a prism of refracting angle 60^∘ so that it just suffers total internal reflection at the other face? The refractive index of the material of the prism is 1.524.

At what angle should a ray of light be incident on the face of a prism of refracting angle 60^∘ so that it just suffers total internal reflection at the other face? The refractive index of the material of the prism is 1.524.

A screen is placed 90 cm from an object. The image an object on the screen is formed by a convex lens two different locations separated by 20 cm. Determine the focal length of the lens is