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Answer to Question #61528 in Other Physics for na

Question #61528

7 The lens of the human eye is
concave
converging
planconcave
diverging
8 Which of the following precautions is NOT applicable to experiment involving planoconvex lens?
planoconvex lens should have small focal length
parallax error should be avoided
the surface of the lens should be cleaned properly
the tip of the optical pin should be at the same level with the principal axis of the lens
9 A glass prism of refracting angle 60 degrees gives a minimum deviation of 47degrees. What is the refractive index of the glass?
1.61
1.20
1.52
1.41
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