What is "twinkling"? (in telescopes) a. flashing of quickly revolving starts b. distortion of light in the very large mirrors of refracting telescopes caused by moving air currents c. distortion of light by lenses more that three feet across due to sagging class d. interference between the lenses of a refracting telescope that distorts the final image

What is "twinkling"? (in telescopes)

A. Flashing of quickly revolving starts

B. Distortion of light in the very large mirrors of refracting telescopes caused by moving air currents

C. Distortion of light by lenses more that three feet across due to sagging class

D. Interference between the lenses of a refracting telescope that distorts the final image

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