Question

5. (20 pts) Geometric Optics

a) True or False? (i) When a light ray from a medium hits the surface of a second medium, the ray is refracted towards the normal if the speed of light in the second medium is less compared to the speed of light in the first medium. _____(ii) When a light ray passes through a lens it bends towards the thicker side of the lens.______ (ii) The image formed by a divergent lens can never be cast on a screen regardless of the location of the object. ______ (iii) The image formed by a convex lens can always be cast on a screen regardless of the location of the object. ______(iv) It is possible for a light ray from a medium incident on the surface of a second medium to not go into the second medium at all if the speed of light in the second medium is higher than the speed of light in the first medium. _____ (v) If a ray consisting of light of two wavelengths from a first medium hits a second medium then the light is split when it goes through the second medium. ________

b) A camera with a 50 mm focal length lens (biconvex) is used to photograph a person 1.8 m tall standing 2 m away. Draw a ray diagram for the image of the person (need not be drawn to scale). When you focus the person in your camera how far is the film or the CCD image capture device (used in phone cameras) from the lens? If the film or the CCD device is of 40 mm height what fraction of the person can you capture in your photograph?

Answer 1

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