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46. The focal length of a concave mirror depends upon (NTSE UJharkhand, Stage-I, 2016-17)
The distance of the object from the mirror
The distance of the image from the mirror
The radius of curvature of the mirror
None of these
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47. 1 dioptre is the power of a lens whose focal length is (NTSE Punjab, Stage-I, 2016-17)
2 m
1 m
3 m
1.5 m
48. Where should an object be placed in front of convex lens to get a real image of the same size of the object? (NTSE Punjab, Stage-I, 2016-17)
At the principal focus of the lens
At twice the focal length
At infinity
Between optical centre of the lens and its principal focus
49. The compound microscope consists of two convex lenses of 5 cm and 20 cm focal length, then which of them will be object lens and eye piece? (NTSE Gujarat, Stage-I, 2016-17)
Object lens with 20 cm focal length and eye piece with 5 cm focal length
Object lens with 5 cm focal length and eye piece with 20 cm focal length
Both should have 20 cm focal length
Both should have 5 cm focal length
50. Which of the following ray diagram is correct? (NTSE Stage-II,2014-15)
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