MCQ 11 MarkWhich mirror is used in periscope?AConvex mirrorBConcave mirror✓Plane mirrorDParabolic mirrorAnswerCorrect option: C. Plane mirrorcView full question & answer→
MCQ 21 MarkLooking into a mirror one finds her image diminished, the mirror is :Aconcave✓convexCcylindricalDparabolicAnswerCorrect option: B. convexbView full question & answer→
MCQ 31 MarkIn case of concave mirror, the minimum distance between an object and its real image is :AfB$2 f$C4 f✓zeroAnswerCorrect option: D. zerodView full question & answer→
MCQ 41 MarkIf an incident ray passes through the centre of curvature of a spherical mirror, the reflected ray will:Apass through its pole✓retraces its pathCpass through its focusDbe parallel to principal axisAnswerCorrect option: B. retraces its pathbView full question & answer→
MCQ 51 MarkA ray of light is incident on a concave mirror. If it is parallel to principal axis, the reflected ray will:✓pass through its principal focusBpass through its centre of curvatureCpass through its poleDretraces its pathAnswerCorrect option: A. pass through its principal focusaView full question & answer→
MCQ 61 MarkA mirror forms a virtual image (diminished) of an object, whatever be the positiion of object :Ait must be a concave mirror✓it must be a convex mirrorCit must be a plane mirrorDit may be (b) or (c) or bothAnswerCorrect option: B. it must be a convex mirrorbView full question & answer→
MCQ 71 MarkA concave mirror is made by cutting a portion of a hollow glass sphere of radius 30 cm . The focal length of the concave mirror is:A24 cmB12 cm✓15 cmD60 cmAnswerCorrect option: C. 15 cm(c)15 cmExplanation:Radius of curvature $= R =30 cm$Forcal length of concave mirror $f=\frac{ R }{2}$ $f=\frac{30}{2}=15 cm$View full question & answer→