Ray OpticsLevel 1
1.If an object is not symmetrically placed between the two plane mirrors, inclined at an angle of40
0
, then the total number of images formed asA. infiniteB. 7C. 8D. 92.A man of height 180 cm is standing in front of a plane mirror. His eyes are at a height of 170cm from the floor. What should be the minimum length of the plane mirror for the man to seehis full length image?A. 180 cmB. 170 cmC. 90 cmD. 85 cm3.Two adjacent walls of a big room are mirror surfaced. A man standing at a large distance infront of one moving horizontally with a speed of 3 m/s. Another man standing in front of theother mirror, at a large distance, observes the image to be moving with a speed of 5 m/s. Whatis the actual speed of the insect?A. 3 m/sB. 5 m/sC.
s/m15
D.
s/m34
4.A man moves towards a plane mirror with a velocity v in a direction making an angle
θ
with thenormal to the mirror. The amplitude of velocity of the image relative to man normal to themirror will beA. 2vB.
θsinv2
C. 2v sin
θ
D. 2v cos
θ
5.A virtual object situated between the pole and the principal focus of a convex mirror producesan image which isA. real, diminished and invertedB. virtual, diminished and uprightC. real, magnified ad uprightD. virtual, diminished and inverted6.A convex mirror has a focal length f. A real object is placed at a distance f in front of it fromthe pole, produces an image atA. infinityB. fC. 2fD. f/27.A concave mirror of focal length f produces an image p times the size of the object. If theimage is real, then the distance of the object from the mirror isA. (p 1)fB. (p + 1)fC.
8.A person standing up in front of a mirror finds his upright image larger than himself. Thisimplies that the mirror isA. convex and sphericalB. convex and cylindrical with axis horizontalC. convex and cylindrical with axis verticalD. concave9.Two plane mirrors are placed perpendicular to each other. A ray of light incident on one mirrorat an angle of incidence
θ
such that the ray finally reflects from the second mirror. Then thefinally reflected ray will beA. inclined at an angle 2
θ
with that incident on the first mirrorB. inclined at an angle (90 -
θ
) with the incident on the first mirrorC. parallel to that incident on the first mirrorD. perpendicular to that incident on the first mirror
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