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41. A mirror which can produce a magnification of +1 is (NTSE Delhi, Stage-I, 2015-16)
Convex mirror
Concave mirror
Plane mirror
Both concave mirror & plane mirror
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42. A beam of light in air is incident upon the smooth plane surface of a piece of flint glass making an angle of 300 with its plane. If the reflected beam and refracted beam are perpendicular to each other, what is the index of refraction of flint glass with respect to air? (NTSE Bihar, Stage-I, 2016-17)
√3
43. Two lenses of power +4 and -6 dioptres are placed in contact with each other. The focal length of the combination will be: (NTSE Odisha, Stage-I, 2016-17)
0.5 meter
-0.1 meter
-0.5 meter
0.1 meter
44. A real and enlarged image can be formed by using a (NTSE Jharkhand, Stage-I, 2016-17)
Either convex or a plane mirror
45. For an incident ray directed towards centre of curvature of a spherical mirror the reflected ray (NTSE Jharkhand, Stage-I, 2016-17)
Retraces its path
Passes through focus
Passes through the pole
Becomes parallel to the principal axis
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