Geometric Optics True or False _______(a) In order for a total internal reflecti

Question

Geometric Optics True or False

_______(a) In order for a total internal reflection of an incident EM wave from vacuum to a glass surface (n = 1.5) to take place, the incident angle must be greater than 41.8 degrees.

_______(b) While the image of an object at the focal point of an optical instrument such as a mirror or a lens is located at infinity, the object distance of an image formed at the focal point can be located at any distance from the instrument.

_______(c) While a concave mirror can form both real and virtual image, a convex mirror can form only virtual image provided that the object is located at any point in front of the corresponding mirror.

_______(d) As you move an object from just outside to just inside the focal point of a converging lens, its image changes from real to virtual, but remain inverted.

_______(e) If the radii of a thin lens are doubled, the focal length of the lens decreases to .

Explanation / Answer

a. False. TIC not possible in case of rarer to denser

b. True

c. True

d. False, image changes from inverted to straight

e. True

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