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36. The image of a candle formed by a convex lens is found to be real and inverted. What change would be found in the nature of this image if the lower half of the lens is covered by black paper? (NTSE Odisha, Stage-I, 2014-15)

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37. The refractive index of glass with respect to air is 1.53 and that of water with respect to air is 1.33. Then a convex lens whose focal length in air is 20 cm, when fully immersed in water would have the focal length (NTSE Odisha, Stage-I, 2014-15)

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38. What is the angle of incidence when the incident ray is normal to the interface or boundary separating two media? (NTSE Chandigarh, Stage-I, 2014-15)

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39. In an experiment with a rectangular glass slab, for an angle of incidence of 60° in air, angle of refraction is measured to be r1. When the glass slab is replaced by a hollow slab filled with water, angle of refraction is measured to be r2. Then
[Given: μwater = 1.33, μglass = 1.5] (NTSE Chandigarh, Stage-I, 2014-15)

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40. A convex lens of focal length f1 is held in contact with a concave lens of focal length f2 We can find is rough focal length of the combination only when: (NTSE Chandigarh, Stage-I, 2014-15)

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