61)For the children below the age of 10 years, the value of least distance of distinct vision is about
62)Pick the false statement on the magnetic field lines
63)The SI units of magnetic flux and magnetic flux density respectively are
64)The development of electromagnetism lead to the invention of
65)The magnetic flux passing through a unit area perpendicular to the field is called
66)When freely suspended, the compass needle come to rest along the geographic
67)If x and y are the temperatures of the hot and cold water samples respectively and z is the final temperature of their mixture, then
68)If i and r are the angle of incidence and angle of refraction, then the equation for the Snell's law is
D)
= constant sin t
A) sini+sinr = constant
B) sini-sinr=constant
C) sinixsinr=constant sini
D) 
= constant sin t
View Answer
D)
= constant sin t
69)A lens is made up of
70)The distance between the focal point and the optic centre gives the
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