Physics - Index of Refraction, Image

#1-A prism with angles 45°, 45° and 90° is to be used to turn a beam of light through a 90° angle. What is the minimum index of refraction for the material of the prism that will give the total internal reflection needed?

#2- A tarantula of height 2.0cm is sitting in front of a spherical mirror with focal length │F│= 4.0cm. The tarantula sees an image of itself that has a height of 0.40cm and appears upright. Is the mirror concave or convex and what are the characteristics of the image?

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...on required is sqrt 2, say 1.414.

(2) Since the image is diminished in size and errect, the mirror must be a convex mirror. The ...