Question

To some degree you can steer a beam of light around tight corners using a fiber optic cable. The physics behind this is best described by: A) Brewster’s angle. B) the critical angle. C) diffraction. D) double slit interference.

Given any lens and a real object arranged so that a virtual image is formed, the image is . A) inverted if shrunk B) always inverted C) never inverted D) inverted if enlarged

Answer 1

1) we can steer a beam of light around tight corners using a fiber optic cable . The physics behind this phenomenon is best described by critical angle . When the light is made to travel inside the fibre optic cable, it undergoes total internal reflection due to refractive index of layer of cladding. Thus , this total internal reflection is based upon CRITICAL ANGLE.

2) any lens and any real object can never make inverted image . Therefore Option C is correct. This is so because both concave and convex lens forms a virtual image under certain conditions but what is common is that both of them form UPRIGHT IMAGES , (which means the virtual images are NEVER INVERTED) .

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