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31. A convex lens is made of a material (μ = 1.2), both the surfaces are convex. If it is dipped in water (μ = 1.33) it will behave like (NTSE Jharkhand, Stage-I, 2014-15)
Convergent lens
Divergent lens
A rectangular slab
A prism
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32. A ray of light passes from denser medium to rarer medium, if thickness of the denser medium is doubled, then the emerging angle is (NTSE Karnataka, Stage-I, 2014-15)
Also doubled
Reduced by its half
Not affected
Critical angle
33. Which of the following group of the ray diagram is correct? (NTSE Karnataka, Stage-I, 2014-15)
a, b and e
b, c and e
d, c and f
a, e and f
34. Which of the following correctly represents graphical relation between the angle of incidence i and angle of reflection r? (NTSE Chhattisgarh, Stage-I, 2014-15)
35. Which of the following lenses would you prefer to use while reading small letters found in a dictionary? (NTSE Chhattisgarh, Stage-I, 2014-15)
Convex lens of focal length 50 cm
Concave lens of focal length 50 cm
Convex lens of focal length 5 cm
Concave lens of focal length 5 cm
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