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51. A beam of light coming from a rarer medium is partially reflected from the surface of a denser medium and partially refracted into the denser medium. If the reflected and the refracted rays are perpendicular to each other and the ratio of the refractive indices of denser and rarer medium is √3, the angle of refraction will be (NTSE Stage-II,2015-16)
600
300
450
41.50
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52. At what distance should an object be placed to obtain its real, inverted and of some height as the object by a convex lens? (NTSE Gujarat, Stage-I, 2016-17)
At focus
Between focus and center of curvature
At center of curvature
Between optical center and focus
53. You are provided with a concave lens having focal length 15 cm. If it diminishes the image by one third, calculate the distance of image from lens? (NTSE Chandigarh, Stage-I, 2015-16)
5 cm
10 cm
5 m
10 m
54. An object is placed at 10 cm from a convex mirror of focal length 20 cm, find the position of image? (NTSE Chandigarh, Stage-I, 2016-17)
3.33 cm behind the mirror
3.33 cm in front of the mirror
6.67 cm in front of the mirror
6.67 cm behind the mirror
55. A light ray enters from medium A to medium B as shown in figure below. The refractive index of medium B relative to A will be (NTSE Chandigarh, Stage-I, 2016-17)
Greater than unity
Less than unity
Equal to unity
Zero
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