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26. Which one of the following phenomena is an example of scattering of light? (NTSE Rajasthan, Stage-I, 2016-17)
Bending of rod at interface of air and water
Twinkling of stars
Tyndall effect
Mirage in desert during summer
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27. Which of the following defects can be rectified by using cylindrical lenses? (NTSE Chandigarh, Stage-I, 2016-17)
Myopia
Presbyopia
Astigmatism
Hypermetropia
28. Which of the following colour of light undergoes the maximum deviation while passing through a glass prism? (NTSE Chhattisgarh, Stage-I, 2016-17)
Red
Blue
Violet
Green
29. A person cannot see distinctly any object placed beyond 40 cm from his eye. What is the power of the lens which will enable him to see distant stars clearly? (NTSE Jharkhand, Stage-I, 2016-17)
+2.5 D
-2.5 D
+3.5 D
-3.5 D
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