Q)
(chatquestion)...11:46 PM
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Dpp (1-3) 12th Physics_Eng_Ans.pdf
(D) a boundary between low index of refraction and high index of refraction materials
Q.7
Aplane mirror is in a vertical plane and is rotating about a vertical axis at 100 rpm. Ahorizontal beam of
light is incident on the mirror. The reflected beam will rotate at:
(А) 100 грm
(B) 141 rpm
(С)0 грm
(D*) 200 rpm
[3]
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Q.8
Which of the following statement is true about a plane mirror.
(A) Focal length zero, magnification infinity
(B) Focal length positive integer, magnification unity
(C) Focal length unity, magnification infinity
(D*) Focal length infinity, magnification unity
[3]
Q.9
Aray of light is incident on a plane mirror, along the direction given by, A = 2î – 3+4k . Find the unit
vector along the reflected ray. Take normal to mirror along the direction of B = 31 – 6j+ 2k
-94î + 237j+ 68k
(A*)
49/29
-94î + 68j- 237k
(B)
[3]
49/29
3i +бј-2k
(C)
(D) None of these
Q.10 The drawing shows a top view of a square room. One wall is missing and the other three are each
mirrors. From point Pin the center of the open side, a laser is fired, with the intent of hitting a small target
located at the center of one wall. Identify vector in whose direction the laser can be fired and score a hit,
assuming that the laser does not strike any mirror more than once.
[4]
Target-
(B*) i+}
(C*) -i+j
(D*) -i+
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