Biconcave lens
The above diagram shows the paths of the beams that travel from the top of the object to the biconcave lens on the right. The beam
X
enters the center of the lens and then goes in a straight line without changing directions. The beam
Y
initially travels towards the point
P'
on the right of the lens, but travels parallel to the lens axis after passing through the lens. The beam
Z
travels towards the point
P
on the left of the lens. The points
P
and
P'
are symmetric with respect to the center of the lens. Which of the following statements is correct?
a) The point
P'
is one of the focal points of the biconcave lens.
b) The beam
Z
travels parallel to the lens axis after passing through the lens.
c) The image of the object is placed between the lens and the object.
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1 solution
Well simple, basic concept of path of light in any type of lens is that : LIGHT BENDS TOWARD BASE !!! yes.... here the ray Y appears to meet at one of the focal length , thus we know that by law that light appears to pass through lens bends parallely to axis . Ray X passes without deflection as it passes through optical centre . While Ray Z even though passing through optical centre according to base law above stated bends to the base , means more lower than its path. There is no possibility that ray Z will be parallel but possible in biCONVEX lens .
Thus (a) and (c) are right :-)