1). Which of the following statements are correct? Total Internal reflection occurs: I. when the angle of incident is greater than the critical angle. II. if the light is travelling from less dense medium to denser medium. III. when the angle of incident is less than the critical angle. IV. if the light is travelling from denser medium to less dense medium. A. I and II B. I and IV C. II and III. D. III and IV.

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19

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explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."