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Q.
Which of the following relations hold good where F is the focal length and R is the radius of curvature.
R = F
R = F2
F = R2
F = 2R
Q. Assertion :Variation of 10 nm in the position of ground mirror also produced flawed images in HST. Reason: Analysis of the flawed images showed that the cause of the problem was that the primary mirror had been ground to the wrong shape.
- Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
- Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
- Assertion is correct but Reason is incorrect
- Both Assertion and Reason are incorrect